| psychology | (noun) the science of mental life | Synonyms: psychological science |
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| psychopathology | (noun) the branch of medicine dealing with the diagnosis and treatment of mental disorders | Synonyms: psychiatry, psychological medicine |
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| (noun) the branch of psychology concerned with abnormal behavior | Synonyms: abnormal psychology |
| psychopharmacology | (noun) the study of drugs that affect the mind | - |
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| psychophysiology | (noun) the branch of psychology that is concerned with the physiological bases of psychological processes | Synonyms: neuropsychology, physiological psychology |
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| pteridology | (noun) the branch of botany that studies ferns | - |
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| radiobiology | (noun) the branch of biology that studies the effects of radiation on living organisms | - |
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| radiology | (noun) (radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation | Synonyms: radioscopy |
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| (noun) the branch of medical science dealing with the medical use of X-rays or other penetrating radiation | - |
| reflexology | (noun) massage to relieve tension by finger pressure; based on the belief that there are reflex points on the feet, hands, and head that are connected to every part of the body | - |
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| (noun) the study of reflex action as it relates to the behavior of organisms | - |
| rheology | (noun) the branch of physics that studies the deformation and flow of matter | - |
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| rheumatology | (noun) the branch of medicine dealing with the study and treatment of pathologies of the muscles or tendons or joints | - |
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| rhinolaryngology | (noun) the medical specialty that deals with diseases of the ear, nose and throat | Synonyms: otolaryngology, otorhinolaryngology |
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| scatology | (noun) (medicine) the chemical analysis of excrement (for medical diagnosis or for paleontological purposes) | - |
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| (noun) a preoccupation with obscenity (especially that dealing with excrement or excretory functions) | - |
| seismology | (noun) the branch of geology that studies earthquakes and the propagation of elastic waves through the Earth or through other planet-like bodies | - |
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| selenology | (noun) the branch of astronomy that deals with the moon | - |
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| semasiology | (noun) the branch of semantics that studies the cognitive aspects of meaning | Synonyms: cognitive semantics, conceptual semantics |
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| semiology | (noun) (philosophy) a philosophical theory of the functions of signs and symbols | Synonyms: semiotics |
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| serology | (noun) the branch of medical science that deals with serums; especially with blood serums and disease | - |
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| sociobiology | (noun) the branch of biology that conducts comparative studies of the social organization of animals (including human beings) with regard to its evolutionary history | - |
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| sociology | (noun) the study and classification of human societies | - |
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| soteriology | (noun) the branch of Christian theology that deals with salvation as the effect of a divine agency | - |
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| spelaeology | (noun) the pastime of exploring caves | Synonyms: speleology |
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| (noun) the scientific study of caves | Synonyms: speleology |
| speleology | (noun) the pastime of exploring caves | Synonyms: spelaeology |
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| (noun) the scientific study of caves | Synonyms: spelaeology |
| stemmatology | (noun) the humanistic discipline that attempts to reconstruct the transmission of a text (especially a text in manuscript form) on the basis of relations between the various surviving manuscripts (sometimes using cladistic analysis) | Synonyms: stemmatics |
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| stogy | (noun) a cheap cigar | Synonyms: stogie |
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| symbology | (noun) the study or the use of symbols and symbolism | - |
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| tautology | (noun) useless and pointless repetition | - |
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| (noun) (logic) a statement that is necessarily true | - |
| technology | (noun) the application of the knowledge and usage of tools (such as machines or utensils) and techniques to control one's environment | - |
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| (noun) machinery and equipment developed from engineering or other applied sciences | - |
| (noun) the discipline dealing with the art or science of applying scientific knowledge to practical problems | Synonyms: applied science, engineering, engineering science |
| teleology | (noun) (philosophy) a doctrine explaining phenomena by their ends or purposes | - |
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| teratology | (noun) the branch of biology concerned with the development of malformations or serious deviations from the normal type of organism | - |
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| terminology | (noun) a system of words used to name things in a particular discipline | Synonyms: language, nomenclature |
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| tetralogy | (noun) a series of four related works (plays or operas or novels) | - |
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| thanatology | (noun) the branch of science that studies death (especially its social and psychological aspects) | - |
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| theatrology | (noun) the study of theatrical performance in relation to its literary, physical, psycho-biological, sociological, and historical contexts. | Synonyms: theatre studies |
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| theology | (noun) the learned profession acquired by specialized courses in religion (usually taught at a college or seminary) | - |
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| (noun) a particular system or school of religious beliefs and teachings | Synonyms: theological system |
| (noun) the rational and systematic study of religion and its influences and of the nature of religious truth | Synonyms: divinity |
| tocology | (noun) the branch of medicine dealing with childbirth and care of the mother | Synonyms: midwifery, OB, obstetrics |
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| topology | (noun) the branch of pure mathematics that deals only with the properties of a figure X that hold for every figure into which X can be transformed with a one-to-one correspondence that is continuous in both directions | Synonyms: analysis situs |
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| (noun) the study of anatomy based on regions or divisions of the body and emphasizing the relations between various structures (muscles and nerves and arteries etc.) in that region | Synonyms: regional anatomy, topographic anatomy |
| (noun) topographic study of a given place (especially the history of the place as indicated by its topography) | - |
| (noun) the configuration of a communication network | Synonyms: network topology |
| toxicology | (noun) the branch of pharmacology that deals with the nature and effects and treatments of poisons | - |
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| traumatology | (noun) the branch of medicine that deals with the surgical repair of injuries and wounds arising from accidents | Synonyms: accident surgery |
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| tribology | (noun) the branch of engineering that deals with the interaction of surfaces in relative motion (as in bearings or gears): their design and friction and wear and lubrication | - |
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| trilogy | (noun) a set of three literary or dramatic works related in subject or theme | - |
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| typology | (noun) classification according to general type | - |
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| uranology | (noun) the branch of physics that studies celestial bodies and the universe as a whole | Synonyms: astronomy |
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| urology | (noun) the branch of medicine that deals with the diagnosis and treatment of disorders of the urinary tract or urogenital system | Synonyms: urogenital medicine |
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| virology | (noun) the branch of medical science that studies viruses and viral diseases | - |
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| volcanology | (noun) the branch of geology that studies volcanoes | Synonyms: vulcanology |
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| vulcanology | (noun) the branch of geology that studies volcanoes | Synonyms: volcanology |
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| zoology | (noun) the branch of biology that studies animals | Synonyms: zoological science |
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| (noun) all the animal life in a particular region or period | Synonyms: fauna |
| zymology | (noun) the branch of chemistry concerned with fermentation (as in making wine or brewing or distilling) | Synonyms: zymurgy |
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