| neurobiology | (noun) the branch of biology that deals with the anatomy and physiology and pathology of the nervous system | - |
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| neurologist | (noun) a medical specialist in the nervous system and the disorders affecting it | Synonyms: brain doctor |
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| neurology | (noun) the branch of medical science that deals with the nervous system | - |
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| (noun) (neurology) the branch of medicine that deals with the nervous system and its disorders | Synonyms: clinical neurology |
| neurophysiology | (noun) the branch of neuroscience that studies the physiology of the nervous system | - |
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| neuropsychology | (noun) the branch of psychology that is concerned with the physiological bases of psychological processes | Synonyms: physiological psychology, psychophysiology |
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| nosology | (noun) the branch of medical science dealing with the classification of disease | Synonyms: diagnostics |
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| numerologist | (noun) a believer in numerology | - |
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| numerology | (noun) the study of the supposed occult influence of numbers on human affairs | - |
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| numismatologist | (noun) a collector and student of money (and coins in particular) | Synonyms: coin collector, numismatist |
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| numismatology | (noun) the collection and study of money (and coins in particular) | Synonyms: coin collecting, coin collection, numismatics |
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| oceanology | (noun) the branch of science dealing with physical and biological aspects of the oceans | Synonyms: oceanography |
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| odontology | (noun) the branch of medicine dealing with the anatomy and development and diseases of the teeth | Synonyms: dental medicine, dentistry |
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| oenologist | (noun) a specialist in wine making | Synonyms: enologist, fermentologist |
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| oenology | (noun) the art of wine making | Synonyms: enology |
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| olfactology | (noun) the scientific study of smells or of the sense of smell. | - |
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| ology | (noun) an informal word (abstracted from words with this ending) for some unidentified branch of knowledge | - |
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| oncologist | (noun) a specialist in oncology | - |
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| oncology | (noun) the branch of medicine concerned with the study and treatment of tumors | - |
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| ontology | (noun) the metaphysical study of the nature of being and existence | - |
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| (noun) (computer science) a rigorous and exhaustive organization of some knowledge domain that is usually hierarchical and contains all the relevant entities and their relations | - |
| oology | (noun) the branch of zoology that studies eggs (especially birds' eggs and their size, shape, coloration, and number) | - |
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| ophthalmologist | (noun) a medical doctor specializing in the diagnosis and treatment of diseases of the eye | Synonyms: eye doctor, oculist |
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| ophthalmology | (noun) the branch of medicine concerned with the eye and its diseases | - |
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| ornithologist | (noun) a zoologist who studies birds | Synonyms: bird watcher |
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| ornithology | (noun) the branch of zoology that studies birds | - |
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| orology | (noun) the science of mountains | Synonyms: orography |
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| oscillogram | (noun) the recording produced by an oscillograph | - |
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| oscillograph | (noun) a device for making a record of the wave forms of fluctuating voltages or currents | - |
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| osteologer | (noun) an anatomist who is skilled in osteology | Synonyms: osteologist |
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| osteologist | (noun) an anatomist who is skilled in osteology | Synonyms: osteologer |
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| osteology | (noun) the branch of anatomy that studies the bones of the vertebrate skeleton | - |
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| otolaryngologist | (noun) a specialist in the disorders of the ear or nose or throat | Synonyms: ear-nose-and-throat doctor, ENT man, otorhinolaryngologist, rhinolaryngologist |
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| otolaryngology | (noun) the medical specialty that deals with diseases of the ear, nose and throat | Synonyms: otorhinolaryngology, rhinolaryngology |
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| otologist | (noun) a physician who specializes in the ear and its diseases | Synonyms: ear doctor, ear specialist |
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| otology | (noun) the branch of medicine concerned with the ear | - |
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| otorhinolaryngologist | (noun) a specialist in the disorders of the ear or nose or throat | Synonyms: ear-nose-and-throat doctor, ENT man, otolaryngologist, rhinolaryngologist |
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| otorhinolaryngology | (noun) the medical specialty that deals with diseases of the ear, nose and throat | Synonyms: otolaryngology, rhinolaryngology |
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| palaeoanthropology | (noun) the scientific study of human fossils | Synonyms: human palaeontology, human paleontology, paleoanthropology |
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| palaeobiology | (noun) a branch of paleontology that deals with the origin and growth and structure of fossil animals and plants as living organisms | Synonyms: paleobiology |
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| palaeoclimatology | (noun) the study of the climate of past ages | Synonyms: paleoclimatology |
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| palaeodendrology | (noun) the branch of paleobotany that studies fossil trees | Synonyms: paleodendrology |
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| palaeoecology | (noun) the branch of ecology that studies ancient ecology | Synonyms: paleoecology |
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| palaeogeology | (noun) the study of geologic features once at the surface of the earth but now buried beneath rocks | Synonyms: paleogeology |
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| palaeology | (noun) the study of (especially prehistoric) antiquities | Synonyms: paleology |
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| palaeontologist | (noun) a specialist in paleontology | Synonyms: fossilist, paleontologist |
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| palaeontology | (noun) the earth science that studies fossil organisms and related remains | Synonyms: fossilology, paleontology |
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| palaeopathology | (noun) the study of disease of former times (as inferred from fossil evidence) | Synonyms: paleopathology |
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| palaeornithology | (noun) the paleobiology of birds | Synonyms: paleornithology |
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| palaeozoology | (noun) the study of fossil animals | Synonyms: paleozoology |
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| palaetiology | (noun) the explanation of past events in terms of scientific causes (as geological causes) | Synonyms: paletiology |
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| paleoanthropology | (noun) the scientific study of human fossils | Synonyms: human palaeontology, human paleontology, palaeoanthropology |
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| paleobiology | (noun) a branch of paleontology that deals with the origin and growth and structure of fossil animals and plants as living organisms | Synonyms: palaeobiology |
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| paleoclimatology | (noun) the study of the climate of past ages | Synonyms: palaeoclimatology |
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| paleodendrology | (noun) the branch of paleobotany that studies fossil trees | Synonyms: palaeodendrology |
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| paleoecology | (noun) the branch of ecology that studies ancient ecology | Synonyms: palaeoecology |
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| paleogeology | (noun) the study of geologic features once at the surface of the earth but now buried beneath rocks | Synonyms: palaeogeology |
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| paleology | (noun) the study of (especially prehistoric) antiquities | Synonyms: palaeology |
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| paleomammalogy | (noun) the paleobiology of ancient mammals | - |
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| paleontologist | (noun) a specialist in paleontology | Synonyms: fossilist, palaeontologist |
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| paleontology | (noun) the earth science that studies fossil organisms and related remains | Synonyms: fossilology, palaeontology |
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| paleopathology | (noun) the study of disease of former times (as inferred from fossil evidence) | Synonyms: palaeopathology |
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| paleornithology | (noun) the paleobiology of birds | Synonyms: palaeornithology |
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| paleozoology | (noun) the study of fossil animals | Synonyms: palaeozoology |
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| paletiology | (noun) the explanation of past events in terms of scientific causes (as geological causes) | Synonyms: palaetiology |
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| parabolograph | (noun) An outdated instrument for drawing parabolas. | - |
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| parallelogram | (noun) a quadrilateral whose opposite sides are both parallel and equal in length | - |
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| paralogism | (noun) an unintentionally invalid argument | - |
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| parapsychologist | (noun) someone who studies the evidence for such psychological phenomena as psychokinesis and telepathy and clairvoyance | - |
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| parapsychology | (noun) phenomena that appear to contradict physical laws and suggest the possibility of causation by mental processes | Synonyms: psychic phenomena, psychic phenomenon |
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| parisology | (noun) the use of ambiguous words | - |
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| pathologist | (noun) a doctor who specializes in medical diagnosis | Synonyms: diagnostician |
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| pathology | (noun) the branch of medical science that studies the causes and nature and effects of diseases | - |
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| (noun) any deviation from a healthy or normal condition | - |
| patrology | (noun) the study of the lives, writings, and doctrines of the Church Fathers | Synonyms: patristics |
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| (noun) the writings of the early Church Fathers | Synonyms: patristics |
| pedology | (noun) the branch of medicine concerned with the treatment of infants and children | Synonyms: paediatrics, pediatric medicine, pediatrics |
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| penologist | (noun) a person who studies the theory and practice of prison management | - |
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| penology | (noun) the branch of criminology concerned with prison management and prisoner rehabilitation | Synonyms: poenology |
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| perinatologist | (noun) an obstetrician specializing in perinatology | - |
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| perinatology | (noun) the branch of obstetrics concerned with the anatomy and physiology and diagnosis and treatment of disorders of the mother and the fetus or newborn baby during late pregnancy and childbirth and the puerperium | - |
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| petrology | (noun) the branch of geology that studies rocks: their origin and formation and mineral composition and classification | Synonyms: lithology |
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| pharmacologist | (noun) someone trained in the science of drugs (their composition and uses and effects) | Synonyms: pharmaceutical chemist |
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| pharmacology | (noun) the science or study of drugs: their preparation and properties and uses and effects | Synonyms: materia medica, pharmacological medicine |
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| phenomenology | (noun) a philosophical doctrine proposed by Edmund Husserl based on the study of human experience in which considerations of objective reality are not taken into account | - |
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| philogyny | (noun) admiration for women | - |
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| philologist | (noun) a humanist specializing in classical scholarship | Synonyms: philologue |
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| philologue | (noun) a humanist specializing in classical scholarship | Synonyms: philologist |
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| philology | (noun) the humanistic study of language and literature | Synonyms: linguistics |
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| phlogiston | (noun) a hypothetical substance once believed to be present in all combustible materials and to be released during burning | - |
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| phlogopite | (noun) a brown form of mica consisting of hydrous silicate of potassium and magnesium and aluminum | - |
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| phonologist | (noun) a specialist in phonology | - |
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| phonology | (noun) the study of the sound system of a given language and the analysis and classification of its phonemes | Synonyms: phonemics |
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| phraseology | (noun) the manner in which something is expressed in words | Synonyms: choice of words, diction, phrasing, verbiage, wording |
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| phrenologist | (noun) someone who claims to be able to read your character from the shape of your skull | Synonyms: craniologist |
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| phrenology | (noun) a now abandoned study of the shape of skull as indicative of the strengths of different faculties | - |
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| phycology | (noun) the branch of botany that studies algae | Synonyms: algology |
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| phylogenesis | (noun) (biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms | Synonyms: evolution, organic evolution, phylogeny |
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| phylogeny | (noun) (biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms | Synonyms: evolution, organic evolution, phylogenesis |
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| physiologist | (noun) a biologist specializing in physiology | - |
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| physiology | (noun) processes and functions of an organism | - |
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| (noun) the branch of the biological sciences dealing with the functioning of organisms | - |
| phytologist | (noun) a biologist specializing in the study of plants | Synonyms: botanist, plant scientist |
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| phytology | (noun) the branch of biology that studies plants | Synonyms: botany |
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| pneumoencephalogram | (noun) an X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast | Synonyms: encephalogram |
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