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psychopathology the scientific study of mental disorders. [2 definitions]
psychopathy mental disease, disorder, or malfunction.
psychopharmacology the study of the effect of drugs on the mind, emotions, and behavior.
psychosexual of or pertaining to the relationship or dynamic between psychological phenomena and sexuality.
psychosis serious mental disorder that affects all aspects of the personality and involves withdrawal from reality.
psychosocial of, pertaining to, affected by, or involving the interaction between the individual personality and its social environment.
psychosomatic of or relating to physical diseases or disorders that are caused or aggravated by emotional factors.
psychotherapy the science or technique of treating mental and emotional problems with psychological methods rather than drugs or medications.
psychotomimetic pertaining to or designating drugs that tend to cause symptoms of a psychotic state.
psychotoxic of, pertaining to, or designating an agent that causes brain damage, such as certain drugs, excessive alcohol, or the like.
psychotropic affecting the activities of the mind, as a tranquilizer, hallucinogen, or the like.
Pt symbol of the chemical element platinum.
Pt. abbreviation of "Point."
pt. abbreviation of "point." [2 definitions]
PTA abbreviation of "Parent-Teacher Association."
ptarmigan any of a variety of grouse that are found in cold, northern regions, and whose brown plumage is replaced by white in the winter.
PT boat a small, swift, highly maneuverable torpedo boat, used esp. to patrol and torpedo enemy merchant ships.
pteridophyte in some systems of classification, a division of plants that have true vascular roots, stems, and leaves and that reproduce by means of spores, such as ferns, club mosses, or horsetails.
ptero- feather; wing.
pterodactyl any of various extinct flying reptiles.
pterosaur a flying reptile of the Mesozoic era characterized as having a birdlike beak and membranous wings supported by an exceptionally long fourth digit of each forelimb.