Ologies

-ology, a suffix derived from the Greek logos,
meaning the 'study of', 'specialty in' or 'art of' a given scientific or medical field.

The following is a long list of ologies, along with their fields of study. Many are common and respected
- many more are obscure and unusual.

A
Abiology	Inanimate things
Acarology	Mites & ticks
Aceology	Therapeutics
Acology	Therapeutic remedies
Acridilogy	Grasshoppers & locusts
Acropathology	Diseases affecting the extremities
Actinology	The chemical effects of light
Adenology	Glands
Aedoeology	Generative organs
Aerobiology	Airborne microorganisms
Aerogeology	Geological features using aerial observation
Aerolithology	Aerolites
Aerology	Atmosphere
Aeropalynology	Polen & spores in the atmosphere
Aetiology	Causes, especially of diseases
Agathology	The good
Agmatology	Fractures
Agniology	Human ignorance
Agriology	The customs of primitive peoples
Agrobiology	Crop-plants & soil control
Agroclimatology	Agricultural meteorology
Agroecology	Sustainable farming systems
Agrogeology	Geology applied to agricultural needs
Agrology	Agricultural soils
Agrometeorology	The weather's effect on landscape
Agrostology	Grasses
Agrotechnology	Technological farming systems
Aitiology	Aetiology
Alethiology	The nature of truth
Algology	Algae
Alimentology	Nutrition
Allergology	Allergies
Alphabetology	The significance of letters of the alphabet
Amphibiology	Amphibia
Anaesthesiology	Anaesthesia
Anaplastology	Prosthetic devices
Anarchaeology	Anarchist cultures
Anatripsology	Friction as a medical treatment
Andrology	Male impotence
Anesthesiology	Anaesthesiology
Angelology	Angels & their hierarchy
Anemology	Wind
Angelology	Angelic beings
Angiology	Blood vessels & lymphatics
Angiopathology	Diseased blood vessels
Anthoecology	The relationship of flowers & their environment
Anthropobiology	Human biological relationships
Anthropology	Humans, mankind
Anthropomorphology	The ascribing of non-human beings with human attributes
Anthroposociology	The human races
Anthrozoology	Animal-human relationships
Aphasiology	Speech disorders
Aphnology	Wealth
Apiology	Bees
Arachnology	Arachnids
Araneology	Spiders
Archaeogeology	Geological formations of the remote past
Archaeology	Ancient cultures
Archaeozoology	Past human-animal relationships
Archology	Government
Arcology	Architecture & ecology
Areology	The planet Mars
Aretology	Virtue
Argyrothecology	Moneyboxes
Aristology	Dining
Arteriology	Arteries
Arthrology	Joints
Arthropathology	Diseases of the joints
Asianology	Fine Asian women
Assyriology	Assyria
Astacology	Crayfish
Astheniology	Diseases caused by weakening
Asthmology	Asthma
Astrobiology	The search for extraterrestrial life
Astrogeology	Extraterrestrial geology
Astrolithology	Meteorites
Astrology	The influence of star movements
Astrometeorology	The effects of heavenly bodies on weather
Astroseismology	Star oscillations
Astrotheology	Theology founded on observation of celestial bodies
Atmology	Watery vapour
Atomology	Atoms
Atmospherology	The atmosphere
Audiology	Hearing
Autecology	The ecology of an individual species
Autobuyology	Car buying
Autology	Oneself
Autonumerology	Automobile license plate numbers
Auxanology	The growth & sexual development of children
Auxology	Growth
Axiology	The ultimate nature of values
Azoology	Inanimate nature
B
Bacteriology	Bacteria
Balneology	Natural & medicinal baths
Barology	Weight & gravitation
Bascology	The Basques
Batology	Brambles
Bibliology	Books; the Bible
Biocenology	Interactions between communities of organisms
Bioclimatology	The effects of climate on living organisms
Biocoenology	Ecologically interdependent plant & animal relationships
Bioecology	The interaction of life & the environment
Biology	Physical life
Biometeorology	Weather & human health
Biospeleology	Cave animal life
Biotechnology	Biological technology
Blogology	Blogs
Bromatology	Food
Brontology	Thunder
Bryology	Mosses
C
Caliology	Bird's nests
Campanology	Bells
Cancerology	Cancer
Carabidology	Carabids
Carcinology	Crustaceans
Cardiology	Heart function & disease
Caricology	Sedges
Carpology	Fruits & seeds
Cartology	Maps & map-making
Catachronobiology	Deleterious effects of time on a living system
Cecidiology	Insect galls
Cephalology	The head
Cerebrology	The cerebrum
Cereology	Crop circles
Cetology	Whales
Chaology	Chaos theory
Characterology	Character
Chemoimmunology	Chemical processes in immunology
Chessology	Chess
Chirology	Palmistry
Chondrology	Cartilages
Choreology	Dance movements
Chorology	Geographical distribution
Chresmology	Oracles
Christology	Jesus Christ
Chromatology	Colours
Chronobiology	Biological rhythms
Chronology	Historical records, etc.
Chronooncology	Influence of biological rhythms on neoplastic growth
Chronopharmacology	Rhythmic, predictable-in-time differences effects of drugs
Chrysology	Precious metals
Climatology	Climate
Clinology	Individual decline after maturity
Coccidology	Scale insects
Codicology	Manuscripts
Coleopterology	Beetles & weevils
Coloproctology	The colon, rectum & anus
Cometology	Comets
Conchology	Shells
Coniology	Koniology
Conscientology	Consciousness
Conspiratology	Conspiracy theories
Coprology	Pornography
Cosmecology	Astrology
Cosmetology	Cosmetics
Cosmochronology	The age of stars
Cosmology	The universe
Crainiology	Skulls
Crenology	The therapeutic use of mineral springs
Criminology	Crime & criminals
Criteriology	Epistemology
Crustaceology	Crustaceans
Cryobiology	The effects of cold on organisms
Cryology	Snow, ice & frozen ground
Cryopedology	The effects of intense frost on soil
Cryptology	Codes & cyphers
Cryptozoology	Mythical creatures
Crystallology	Crystals
Ctetology	Acquired characteristics
Cyclonology	Cyclones
Cyesiology	Pregnancy
Cynology	Dogs
Cystology	Cysts
Cytology	Cells
Cytopathology	Cell diseases
D
Dactyliology	Finger-rings
Dactylology	Sign language
Daemonology	Demonology
Dantology	Dante Alighieri & his work
Defectology	Special education
Deltiology	Postcards
Demology	Human activities
Demonology	Demons & evil spirits
Dendrochronolgy	Tree growth rings
Dendroclimatology	Tree growth & climate
Dendrohydrology	Hydrological phenomena using tree-ring data
Dendrology	Trees
Dendropyrochronology	Wildfires using tree-ring data
Deontology	Moral duty
Dermatology	The skin & related diseases
Dermatoneurology	The nerves of the skin
Dermatopathology	Inflammatory skin diseases
Dermatovenerology	Skin & venereal diseases
Dermonosology	The nomenclature & classification of skin diseases
Desmidiology	Desmids
Desmology	Ligaments & sinews
Diabetology	Diabetes mellitus
Diabology	Devils
Dialectology	Dialect
Diplomatology	Diplomats
Dipterology	Two-winged insects
Docimology	Experimental testing or inquiry
Dosiology	Doses
Draconology	Dragons
Dysteleology	Purposelessness in nature
E
Ecclesiology	Churches
Eccrinology	Excretion & secretion
Echinology	Echinoderms
Ecology	Interactions in environments
Ecopsychology	Ecology & psychology
Ecotoxicology	Environmental pollutants
Edaphology	Soils
Editology	Editing
Egyptology	Ancient Egypt
Eidology	Mental imagery
Electrobiology	The electric phenomena of living organisms
Electrology	Hair removal using electrical probes
Electrophysiology	Electric phenomena in living organisms
Electrotechnology	Electricity in technology
Emblematology	Emblems
Embryology	Embryos
Emetology	Vomiting
Emmenology	Menstruation
Encephalology	The brain
Endemiology	Indigenous diseases
Endocrinology	Glands
Enigmatology	Puzzles
Enology	Oenology
Enteradenology	The glands of the alimentary canal
Enterology	The intestines
Entomechology	The design of mechanical insects
Entomology	Insects
Entozoology	Animals that live inside other animals
Entreprenology	The creation & extraction of value from an environment
Enzymology	Enzymes
Epidemiology	Epidemic diseases
Epileptology	Epilepsy
Epiphytology	Plant diseases
Epistemology	Knowledge
Epizootiology	Animal diseases
Eremology	Deserts
Ergology	The effects of work on humans
Erotology	Sexual stimuli & behaviour
Escapology	Escape from confinement
Eschatology	Death, resurrection, afterlife, etc.
Esperatology	Esperanto
Esthematology	Senses & sense organs
Esthesiology	Sensory phenomena
Esthesiophysiology	The physiology of sensation & the sense organs
Ethnobiology	Life pertaining to certain peoples
Ethnology	Human races
Ethnoarchaeology	Archaeology of different societies
Ethnomethodology	Everyday human communication by speech
Ethnomusicology	The music of different societies
Ethnopsychology	The comparative psychology of races & peoples
Ethology	Animal or human behaviour
Etiology	Aetiology
Etruscology	The Etruscans
Etymology	The origin of words
Exobiology	The possibility of extraterrestrial life
F
Faunology	The geographical distribution of animals
Fermentology	Beer brewing
Fetology	The fetus in the uterus
Filicology	Ferns
Filmology	Films
Fluviology	Watercourses
Fluviomorphology	The formation & characteristics of river channels
Foliology	Autumnal leaf colour changes
Fontology	Fonts
Fossilology	Fossil organisms
Fromology	Cheeses
Fungology	Fungi
Futurology	The future
G
Galvanology	Galvanism
Garbology	Waste disposal
Gastroenterology	Diseases of the stomach & intestines
Gastrology	The stomach
Gelotology	Laughter
Gemmology	Gems
Genecology	Animal species & their environment
Geneology	Family history (genealogy)
Genesiology	Heredity or procreation
Geochronology	Geological time
Geohydrology	Subterranean water
Geology	The earth's crust & strata
Geomorphology	Land forms
Geomythology	Geology using folklore
Geotectology	The structure of the earth's crust
Gephyrology	Bridges
Geratology	Ageing & decay
Gerodontology	Age-related oral diseases
Gerontology	Characteristics of old age
Ghostology	Ghosts
Gizmology	Technological gadgetry
Glaciology	Glaciers
Glossology	The tongue
Glottochronology	The history of language
Glottology	Language
Glycobiology	Molecules containing carbohydrates
Glyptology	Gem engravings
Gnathology	Dental occlusions
Gnomonology	Gnomonics
Gnosiology	Knowledge
Gnotobiology	Germ-free life
Googlology	The Google search engine
Googology	Large numbers
Graminology	Grasses
Grammatology	Writing systems
Graphology	Handwriting
Graphopathology	Handwriting as a symptom of mental disorder
Gynaecology	The functions & diseases of women
H
Haematology	Blood
Haemorheology	Blood viscosity
Hagiology	Saints
Hamartiology	Sin
Harmonology	Harmonisation
Hedonology	Pleasure
Helcology	Ulcers
Heliology	The sun
Helioseismology	Solar wave oscillations
Helminthology	Worms, especially parasitic
Hemipterology	Hemipteras
Hemopathology	Bood diseases
Heortology	Religious festivals
Hepaticology	Liverworts
Herbology	Medicinal herbs
Heresiology	Heresy
Herpetology	Reptiles & amphibians
Heterology	Abnormalities in tissue structure
Hexicology	Ecology
Hexiology	Habits
Hieroglyphology	Hieroglyphs
Hierology	Religious or sacred literature or lore
Hippology	Horses
Hippopathology	Diseases of horses
Histiology	Histology
Histology	Organic tissue
Histophysiology	The structure & function of tissues
Historiology	History
Hittitology	The Hittites
Homerology	Homer & his poems
Hoplology	Weapons & fighting systems
Hormonology	Hormones
Horology	The measurement of time
Humorology	Humour
Hydrobiology	The biology of aquatic organisms
Hydrogeology	The geological effects of water
Hydrology	Water
Hydrometeorology	Atmospheric moisture
Hyetology	Rainfall
Hygiology	Hygiene
Hygrology	Humidity
Hylology	Matter
Hymenopterology	Insects with four membranous wings
Hymnology	Hymns
Hypnology	Sleep
I
Iamatology	Medical remedies
Iatrology	Medicine
Ichnolithology	Ichnology
Ichnology	Fossil footprints
Ichthyology	Fish
Iconology	Images, pictures, etc.
Ideology	Ideas
Idiomology	Idioms
Immunohematology	Blood group antigens & antibodies
Immunology	Immunity
Immunopathology	Diseases of the immune system
Indology	India
Insectology	Entomology
Irenology	Peace
Iridology	The iris of the eye
J
Japanology	Japan
K
Kalology	Beauty
Karyology	Cell nuclei & chromosomes
Kidology	Kidding
Kinesiology	Human movement
Kinology	Motion
Koniology	Dust & germs in the atmosphere
Kremlinology	The Russian government
Ktenology	Killing
Kymatology	Wave motion
L
Labology	Beer & wine bottle labels
Lalopathology	Speech disorders
Laryngology	The larynx
Latrinology	Writings on toilet walls
Lectinology	Lectins
Lemology	Epidemic diseases
Lepidopterology	Butterflies & moths
Leprology	Leprosy
Lexicology	Words & their meanings
Lichenology	Lichens
Limacology	Slugs
Limnobiology	Freshwater life
Limnology	Bodies of fresh water
Lipsology	Lip prints
Lithoidology	Rocks
Lithology	The composition, structure & classification of rocks
Liturgiology	Liturgical forms
Logology	Words
Logyology	The study of
Loimology	Plagues
Ludology	Games
Lymphology	The lymphatic system

M
Machirology	Knives
Macrocosmology	The universe
Macrometeorology	Largest-scale aspects of the atmosphere
Magirology	Cookery
Malacology	Mollusks
Malacostracology	Crustaceology
Malariology	Malaria
Mammalogy	Mammals
Mantology	Divination
Mariology	The Virgin Mary
Martyrology	Martyrs
Mastology	Mammalogy
Meconology	Opium
Melissopalynology	Honey
Mellittology	Bees
Membranology	Membranes
Mereology	Part-whole relationships
Mesology	Ecology
Mesometeorology	Mesoscale atmospheric phenomena
Metapsychology	Psychology beyond the limits of experimentation
Meteorology	Atmosphere, weather prediction
Methodology	Order
Metrology	Measurement
Miasmology	Miasmas
Microbiology	Microorganisms
Microclimatology	Microclimates
Micrometeorology	Small-scale weather conditions
Micropalaeontology	Microscopic fossils
Microphytology	Microscopic vegetable organisms
Micrology	Microscopic objects
Microseismology	Small earth tremors
Mineralogy	Minerals
Mixology	Cocktail recipes
Mnesiology	Memory
Molinology	Mills & milling
Momiology	Mummies
Monadology	Monads
Morphology	The structure of organisms
Muscology	Mosses
Museology	Museum management
Musicology	Music
Mycetology	Mycology
Mycology	Fungi
Mycotoxicology	Toxic fungi
Myology	Muscles
Myrmecology	Ants
Mythology	Myths
N
Nanotechnology	Very small objects
Naology	Ecclesiastical buildings
Narratology	Narrative works
Nasology	The nose
Nassology	Taxidermy
Nematology	Nematodes
Neology	New words
Neonatology	Newborn babies
Neossology	Nestling birds
Nephology	Clouds
Nephrology	The kidneys
Nerterology	The dead or the underworld
Neurobiology	The biology of the nervous system
Neuroendocrinology	Neuroendocrine systems
Neurology	Nerve systems
Neuropathology	Diseases of the nervous system
Neuropharmacology	Nervous system medication
Neurophysiology	Functions of the nervous system
Neuropsychology	Psychology based on the nervous system
Neuropterology	Insects of the order Neuroptera
Neuroradiology	Radiology of the nervous system
Neurotheology	The biochemical origins of religious experiences
Neurypnology	Hypnotism & sleep
Nidology	Bird's nests
Nomology	Law
Noology	Intuition & reason
Nosetiology	Causes of disease
Nosology	Classification of diseases
Nostology	Senility
Numerology	The significance of numbers
Numismatology	Coins & medals
Nymphology	Nymphs
O
Oceanology	Oceans
Odology	The mystical force of od
Odonatology	Dragonflies
Odontology	Teeth
Oecology	Ecology
Oenology	Wines
Oikology	Domestic economy
Olfactology	Smells
Oligochaetology	Oligochaete worms
Omenology	Omens
Ombrology	Rain
Omnibology	Motorbuses
Oncology	Tumours & cancers
Oneirology	Dreams
Onomasiology	Related words & their meanings
Onomatology	Names
Ontology	The nature of being
Onychopathology	Diseases of the nails
Oology	Bird's eggs
Ophidology	Amphibians & reptiles
Ophiology	Snakes
Ophthalmology	Eyes
Opsonology	Opsonin
Optology	Sight
Orchidology	Orchids
Organology	The organs of the body
Orismology	Definitions of technical terms
Ornithology	Birds
Orology	Mountains
Orrhology	Blood serums
Orthopterology	Insects of the order Orthoptera
Oryctology	Mineralogy or palaeontology
Osmology	Smells & olfactory processes
Osphresiology	Osmology
Osteology	Bones
Osteopathology	Diseases of the bones
Otolaryngology	Diseases of the ear & throat
Otology	The ears
Otorhinolaryngology	Ear, nose & throat medicine
Ourology	Urology
Ovology	Eggs
P
Pachydermatology	Elephant skin
Paedology	Children
Paidonosology	Paediatrics
Palaeichthyology	Extinct fishes
Palaeoanthropology	Ancient human-like creatures
Palaeobiology	Ancient life
Palaeobotany	Fossil plants
Palaeoclimatology	Climates of the geological past
Palaeodendrology	Fossil trees
Palaeoecology	The ecology of ancient organisms
Palaeoentomology	Fossil insects
Palaeoetiology	Past events in terms of scientific causes
Palaeogeology	Buried geological features
Palaeohydrology	Past hydrologic systems
Palaeolimnology	Lake sediments
Palaeology	Antiquities
Palaeometeorology	Past patterns of global atmospheric transport
Palaeontology	Ancient life, through fossils
Palaeo-ornithology	Fossil birds
Palaeo-osteology	Ancient bones
Palaeopathology	Diseases of the past
Palaeopedology	Early soils
Palaeophytology	Fossil plants
Palaeotempestology	Ancient storms
Palaeozoology	Ancient animals
Palynology	Pollen & spores
Pantology	All branches of knowledge
Pantheology	Theology embracing all religions
Papyrology	Papyri
Parapsychology	Extraordinary mental phenomena
Parasitology	Parasites
Paroemiology	Proverbs
Parthenology	Virginity
Pathology	Disease
Patrology	Patristics
Pedology	Soil
Pelology	Mud as a therapy
Penology	Punishment & prison management
Periodontology	Diseases of tissue around teeth
Pernalogy	Pearls
Pestology	Pests, especially insects
Petrology	Rocks
Phagology	Eating
Phallology	The penis
Phantasmology	Spiritualistic manifestations & apparitions
Phantomology	Supernatural beings
Pharmacoendocrinology	The pharmacology of endocrine function
Pharmacology	Drugs
Pharology	Lighthouses
Pharyngology	The pharynx
Phenology	Periodic biological phenomena
Phenomenology	Phenomenons
Pherology	The human carrying capacity of the Earth
Philematology	Kissing
Philology	Language
Phlebology	Veins
Phonology	Speech sounds
Phorology	Disease carriers & epidemic or endemic diseases
Photobiology	The effects of light on living organisms
Photology	Light
Phrenology	Skull form as indication of character
Phthisiology	Pulmonary tuberculosis
Phycology	Seaweeds or algae
Physicology	Physics
Physiology	The functions of living organisms
Phytobacteriology	Plant bacteria
Phytolithology	Palaeobotany
Phytology	Plants
Phytomorphology	Plant morphology
Phytonematology	Plant nematodes
Phytopaleontology	Fossil plants
Phytopathology	Plant diseases
Phytopharmacology	Medicinal plants
Phytophenology	Plant phenology
Phytophysiology	Plant physiology
Phytosociology	Plant relationships & characteristics
Phytovirology	Plant viruses
Piscatology	Fishing
Pisteology	Faith
Pistology	Pisteology
Placentology	The placenta
Planetology	Planets
Plangonology	Dolls
Planktology	Plankton
Plebology	Adolescents
Plutology	Wealth
Pneumatology	Spiritual existence
Pneumonology	The lungs
Podology	The feet
Poenology	Penology
Pogonology	Beards
Polemology	Wars
Polychaetology	Ploychaete worms
Pomology	Fruit growing
Ponerology	Evil
Posology	Medical doses
Potamology	Rivers
Praxiology	Human action & conduct
Primatology	Primates
Proctology	The anus & rectum
Projectiology	Out-of-body experiences
Promorphology	Crystallography of organic forms
Protistology	Protists
Protoanthropology	Humans prior to the invention of writing
Protoarcheology	Prehistoric human artifacts & fossils
Protozoology	Single-celled animals
Psephology	Elections & voting
Psychobiology	Biology relating to mind & behaviour
Psychology	Mind & behaviour
Psychopathology	Mental & behavioural aberrance
Psychopharmacology	The effects of drugs on the mind
Psychophysiology	Mental phenomena
Psychosociology	Issues common to psychology & sociology
Psychotechnology	Psychology in problem solving etc.
Pteridology	Ferns
Pterylology	The arrangement of bird's feathers
Ptochology	Pauperism & unemployment
Pulicologist	Fleas
Punnology	Puns
Pyramidology	Pyramids
Pyretology	Fevers
Pyrgology	Towers
Pyritology	Pyrites
Pyrology	Heat or fever & its effects
Q
Quinology	The cinchona
R
Rabdology	Arithmetic using Napier's Bones
Raciology	Racial differences
Radiobiology	The effects of radiation on the body
Radioecology	The environmental impact of radioactive substances
Radiogeology	The relation of radioactivity to geology
Radioimmunology	Immunology using radiology
Radiology	High-energy radiation
Radiotechnology	Radiological technologies
Reactology	Psycholological reactions
Reflexology	Reflexes
Respirology	Respiration
Rhabdology	Rabdology
Rhematology	Rhemes
Rheology	Flow & deformation of matter
Rheumatology	Rheumatism
Rhinology	The nose
Roentgenology	Radiology
Rumpology	Fortune telling by reading the rump
Runology	Runes
S
Sarcology	Fleshy parts of the body
Satanology	Satan
Scatology	Excrement or obscenity
Scelerology	The outercoat of the eyeball
Scolecology	Helminthology
Sedimentology	Sedimentary rocks
Seismology	Earthquakes
Selenolgy	The moon
Selenomorphology	The lunar surface & landscape
Semantology	The meaning of words
Semasiology	Semantics
Sematology	Semantics
Semeilogy	Semiology
Semiology	Signs & symbols
Serology	Serums
Sexology	Sexual behaviour
Siagonology	Jawbones
Sialosemeiology	Saliva as an aid to diagnosis
Sindology	Shrouds
Sindonology	The Turin Shroud
Sinology	China
Siphonapterology	Fleas
Sitiology	Diet
Sitology	Sitiology
Skatology	Scatology
Sociobiology	Human & animal social behaviour
Sociology	Society
Somatology	The properties of substances
Somatotypology	Somatotypes
Sophiology	Ideas
Sophology	Wisdom
Soteriology	Salvation
Sovietology	The Soviet Union
Spectrology	Spectrum analysis
Spelaeology	Speleology
Speleology	Caves
Spermology	Seeds
Sphagnology	Peat or bog moss
Sphygmology	The pulse
Splanchnology	The viscera
Splenology	The spleen
Spongology	Sponges
Stasiology	Political parties
Stemmatology	Relationships between texts
Stereology	Geometrical quantities
Stigmeology	Proper punctuation
Stoichiology	Animal tissues
Stomatology	Mouth disorders
Storiology	Folklore
Stromatology	The formation of stratified rocks
Stygobiology	Stygobites
Suicidology	Suicide
Sumerology	The Sumerians
Symbology	Symbols
Symptomatology	Disease symptoms
Synchronology	Comparative chronology
Syndesmology	Ligaments
Synechology	Continuity or union of things
Synecology	Ecological communities
Synosteology	Arthrology
Syphilology	Syphilis
Systematology	Systematics
Systemology	The logic of systems
T
Tartarology	Hell
Taxology	Taxonomy
Technicology	Technology
Technology	Mechanical arts
Tecnology	Children
Tegestology	Beer mats
Teleology	Final causes
Teleseismology	Tremors due to distant earthquakes
Telmatology	Swamps
Tenontology	Tendons
Tephrochronology	Tephra deposits
Teratology	Congenital malformations
Terminology	Terms
Testaceology	Conchology
Teuthology	Cephalopods
Textology	The production of texts
Thanatology	Death
Thaumatology	Wonders and miracles
Theology	Theistic religion
Thereology	Therapeutics
Theriogenology	Animal reproductive systems
Thermatology	Heat as a medical remedy
Thermology	Heat
Therology	Wild mammals
Thremmatology	Animal & plant breeding
Threpsology	Nutrition
Thymology	The feelings
Tidology	Tides
Timbrology	Postage stamps
Timology	Values
Tocology	Obstetrics
Tonology	Tones or speech intonations
Topology	Geometrical properties & relationships
Toxicology	Poisons
Trachelology	The neck
Traumatology	Wounds
Tribology	Friction & lubrication
Trichology	Hair
Trophology	Nutrition
Tropology	Figures of speech
Tsiganology	Gypsies
Tsiology	Tea
Turkology	Turkey
Typhlology	Blindness
Typology	Types, especially Biblical
Typtology	Spirit rappings
U
Ufology	Unidentified flying objects
Universology	The universe
Uranology	The heavens
Urbanology	Cities
Uredinology	Rusts
Urenology	Rust moulds
Urinology	Urology
Urogynecology	Female pelvic floor disorders
Urolithology	Urinary calculi
Urology	The urinary system
Uronology	Urine
V
Vaccinology	Vaccines
Venereology	Venereal diseases
Vermeology	Worms
Vexillology	Flags
Victimology	Victims
Vinology	Wines & winemaking
Virology	Viruses
Vitaminology	Vitamins
Volcanology	Vulcanology
Vulcanology	Volcanoes
Vulvology	Vaginas
X
Xenobiology	Extraterrestrial life
Xenozoology	Animal alien life forms
Xylology	The structure of wood
Z
Zoology	Animals
Zoonosology	Zoonotic bacterial diseases
Zoopathology	Animal pathology
Zoophysiology	Animal physiology
Zoophytology	Biology of zoophytes
Zoopsychology	Animal psychology
Zygology	Joining & fastening
Zymology	Fermentation

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Note: While the majority of words ending in 'ology' mean 'the science of', systematic study of', etc.,
there are exceptions, for example:

acyrology (obsolete, incorrect diction), amphibology (ambiguous speech), antapology (a reply to an apology), anthology (a collection of literary pieces), apology (a statement of regret), arcology (a self-contained city or other environment), atheology (antagonism to theology), battology (unnecessary repetition), cacology (incorrect diction), carphology (the grasping movements of delirious patients), curiology (picture-writing), dicaeology (a form of rhetorical device), dittology (a double reading of a text), doxology (a hymn of praise to God), eikonolgy (metaphor), euchology (a prayer book), gigantology (an account or description of giants), gnomology (a collection of maxims), haplology (a speech omission), hemerology (a calendar), heterology (lack of correspondence between bodily parts), historiology (a discourse on history), homology (correspondence), leptology (a tedious discourse on trifling things), macrology (redundancy), martyrology (a history of martyrs), mateology (a vain, unprofitable discourse or inquiry), menology (a calendar of months), misology (hatred of reason or knowledge), monology (soliloquy), morology (nonsense), necrology (a death-roll), onology (foolish discourse), orthology (correct use of words), pantology (a system of universal knowledge), paradoxology (the use of paradoxes), parisology (the use of ambiguous words), paromology (a debating strategy), perissology (superfluity of words), phraseology (a mode of expression), pseudology (lie-telling), psilology (love of empty talk or noise), Scientology (a religious movement), tautology (repetition using different words), tecnology (teaching of children), (Torontology (a branch of metaphysics), tropology (use of figurative language), xenodochienology (jocular, love of hotels & inns).