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pseudonarcotic
Inducing sleep by reason of a sedative effect, but not directly narcotic.
pseudoneoplasm
SYN: pseudotumor.
pseudoneuroma
SYN: traumatic neuroma.
pseudonit
SYN: hair cast.
Pseudoobstruction, intestinal
A group of chronic disorders that impair gastrointestinal motility, despite the absence of an actual obstruction. Symptoms include cramping and abdominal pain, malnutrition, ...
Pseudoobstruction, myopathic
Intestinal pseudoobstruction caused by damage to muscle cells in the walls of the bowel.
Pseudoobstruction, neuropathic
Intestinal pseudoobstruction caused by damage to nerve cells in the walls of the bowel.
pseudopapilledema
Anomalous elevation of the optic disk; seen in severe hyperopia and optic nerve drusen.
pseudoparalysis
Apparent paralysis due to voluntary inhibition of motion because of pain, incoordination, or other cause, but without actual paralysis. SYN: pseudoparesis (1). - arthritic ...
Pseudoparalysis, spastic
Better known as Creutzfeldt-Jakob disease (CJD). A dementing disease of the brain. CJD is believed to be due to a highly unconventional transmissible agent named a prion. It is ...
pseudoparaplegia
Apparent paralysis in the lower extremities, in which the tendon and skin reflexes and the electrical reactions are normal; the condition is sometimes observed in rickets. - ...
pseudoparasite
A false parasite; may be either a commensal or a temporary parasite (the latter being an organism accidentally ingested and surviving briefly in the intestine).
pseudoparenchyma
In fungi, a tissue-like mass of modified hyphae.
pseudoparesis
1. SYN: pseudoparalysis. 2. A condition marked by the pupillary changes, tremors, and speech disturbances suggestive of early paretic neurosyphilis, in which, however, the ...
pseudopelade
A scarring type of alopecia; usually occurs in scattered irregular patches; of uncertain cause. SYN: p. of Brocq. [pseudo- + Fr. pelade, disease that causes sporadic falling of ...
pseudopericarditis
An artifact of auscultation resembling a friction rub, but due to movement of the tissue in the intercostal space when the diaphragm of the stethoscope is placed over the ...
pseudoperoxidase
Referring to the nonenzymatic, heat-stable peroxidase activity associated with hemeproteins.
pseudophacos
SYN: lenticulus. [pseudo- + G. phakos, lens]
pseudophakia
An eye in which the natural lens is replaced with an intraocular lens. [pseudo- + phakos, lentil (lens)]
pseudophakodonesis
Excessive mobility of an intraocular lens implant.
pseudophotesthesia
SYN: photism. [pseudo- + G. phos, light, + aisthesis, sensation]
pseudophyllid
Common name for members of the order Pseudophyllidea.
Pseudophyllidea
An order of tapeworms with an aquatic life cycle, passing through coracidium, procercoid, and plerocercoid stages before developing into adults in fish, marine mammals, or ...
pseudoplatelet
Any of the fragments of neutrophils that may be mistaken for platelets, especially in peripheral blood smears of leukemic patients.
pseudopocket
A pocket, adjacent to a tooth, resulting from gingival hyperplasia and edema but without apical migration of the epithelial attachment.
pseudopod
SYN: pseudopodium.
pseudopodium
A temporary protoplasmic process, put forth by an ameboid stage or amebic protozoan for locomotion or for prehension of food. SYN: pseudopod. [pseudo- + G. pous, foot]
pseudopolydystrophy
SYN: mucolipidosis III.
pseudopolyp
A projecting mass of granulation tissue, large numbers of which may develop in ulcerative colitis; may become covered by regenerating epithelium. SYN: inflammatory polyp.
pseudoporphyria
A condition clinically identical to porphyria but with no abnormality in porphyrin excretion, consequent to drug ingestion or hemodialysis.
pseudopregnancy
1. SYN: false pregnancy. 2. A condition in which symptoms resembling those of pregnancy are present, but which is not pregnancy; occurs after sterile copulation in mammalian ...
pseudoprognathism
An acquired projection of the mandible due to occlusal disharmonies that force the mandible forward; the mandibular condyles are forward of their expected functional position.
pseudopterygium
Adhesion of the conjunctiva to the cornea, occurring after injury.
pseudoptosis
A condition resembling an inability to elevate the eyelid, due to blepharophimosis, blepharochalasis, or some other affection. SYN: false blepharoptosis. [pseudo- + G. ptosis, ...
pseudopuberty
Condition characterized by the precocious development of a varying number of the somatic and functional changes typical of puberty; commonly caused by the hormonal secretions of ...
pseudoreaction
A false reaction; one not due to specific causes in a given test.
pseudoreplica
A specimen for electron microscopic examination obtained by depositing particles from a virus-containing suspension on an agarose surface, covering the surface with a ...
pseudoretinitis pigmentosa
A widespread pigmentary mottling of the retina that may follow severe eye trauma, especially from a penetrating injury.
pseudorheumatism
1. Joint or muscle symptoms without objective findings and with no apparent underlying causes. 2. Feigned joint symptoms (obsolete).
pseudorickets
SYN: renal rickets.
pseudorosette
Perivascular radial arrangement of neoplastic cells around a small blood vessel. See rosette (2).
Pseudorubella
Synonymous with Roseola infantum, a viral disease of infants sudden onset of high fever which lasts several and young children with days and then suddenly subsides leaving in its ...
pseudosarcoma
A bulky polyploid malignant tumor of the esophagus, composed of spindle cells with a focus of squamous cell carcinoma; spindle cells may be epithelial or metaplastic malignant ...
pseudoscarlatina
Erythema with fever, due to causes other than Streptococcus pyogenes.
pseudosclerosis
Inflammatory induration or fatty or other infiltration simulating fibrous thickening. [pseudo- + G. sklerosis, hardening]
pseudoseizure
A psychogenic seizure.
pseudosmallpox
SYN: alastrim.
pseudosmia
Subjective sensation of an odor that is not present. [pseudo- + G. osme, smell]
Pseudostertagia bullosa
One of the medium stomach worms located in the abomasum of sheep, goats, and pronghorn; it is found chiefly in the western U.S.
pseudostoma
An apparent opening in a cell, membrane, or other tissue, due to a defect in staining or other cause. [pseudo- + G. stoma, mouth]
pseudostrabismus
The appearance of strabismus caused by epicanthus, abnormality in interorbital distance, or corneal light reflex not corresponding to the center of the pupil. [pseudo- + G. ...
pseudotabes
A syndrome having the characteristics of tabetic neurosyphilis but not due to syphilis. SYN: Leyden ataxia. - pupillotonic p. SYN: Adie syndrome.
pseudotruncus arteriosus
Congenital cardiovascular malformation with atresia of the pulmonic valve and absence of the main pulmonary artery; the lungs are supplied with blood either through a patent ...
pseudotubercle
A nodule histologically similar to a tuberculous granuloma, but due to infection by some microorganism other than Mycobacterium tuberculosis.
pseudotuberculosis
A disease of a wide variety of animal species caused by the bacterium Yersinia p.. Epizootics of p. are commonly seen in birds and rodents, often with high case fatality rates. ...
pseudotumor
An enlargement of nonneoplastic character that clinically resembles a true neoplasm so closely as to often be mistaken for such. SYN: pseudoneoplasm. - p. cerebri a disorder, ...
Pseudotumor cerebri
Increased pressure within the brain in the absence of a tumor. Symptoms may include headache, nausea, vomiting, pulsating intracranial noises, singing in the ears, double vision, ...
pseudounimolecular
Referring to a reaction whose rate appears to be dependent on the concentration of only one substrate; usually due to a constant, saturating level of the other compounds. SYN: ...
pseudouridine
5-β-d-Ribosyluracil; a naturally occurring isomer of uridine found in transfer ribonucleic acid s; unique in that the ribosyl is attached to carbon (C-5) rather than to ...
pseudovacuole
An apparent vacuole in a cell, either an artifact or an intracellular parasite.
pseudovariola
SYN: alastrim. [pseudo- + L. variola, smallpox]
pseudoventricle
SYN: cavity of septum pellucidum.
pseudovitamin
A substance having a chemical structure very similar to that of a given vitamin, but lacking the usual physiologic action. - p. B12 cobamide cyanide phosphate, 3′-ester with ...
pseudovomiting
Regurgitation of matter from the esophagus or stomach without expulsive effort.
Pseudoxanthoma elasticum
: (Abbreviated PXE). A genetic disorder of elastic fiber degeneration with tiny areas of calcification in the skin, back of the eyes (retinae), and blood vessels. PXE is ...
psi
1. The 23rd letter of the Greek alphabet (ψ). 2. (ψ) Symbol for pseudouridine; pseudo-; wave function; the dihedral angle of rotation about the C1–Cα bond associated with a ...
psicose
A ketohexose; d-p. is epimeric with d-fructose. SYN: pseudofructose, ribo-2- hexulose.
psilocin
A hallucinogenic agent related to psilocybin.
Psilocybe
A genus of mushrooms (family Agaricaceae) containing many species with psychotropic or hallucinogenic properties, including P. mexicana, of which the fruiting bodies are a source ...
psilocybin
The N′,N′ -dimethyl derivative of 4-hydroxytryptamine; obtained from the fruiting bodies of the fungus Psilocybe mexicana and other species of Psilocybe and Stropharia. P. ...
psilosis
Falling out of the hair. [G. p., a stripping, fr. psilos, bare]
psilothin
A depilatory plaster applied when warm to a hairy surface, and ripped off when cool, causing removal of the hairs. [see psilosis]
psilotic
1. Relating to psilosis. 2. SYN: epilatory (1).
psittacine
Referring to birds of the parrot family (parrots, parakeets, and budgerigars).
psittacosis
An infectious disease in psittacine birds and humans caused by the bacterium Chlamydia psittaci. Avian infections are mainly inapparent or latent, although acute disease does ...
Psittacosis (parrot fever)
An infectious disease due to a bacteria (Chlamydia psittaci) contracted from psittacine birds, especially caged birds like parrots, parakeets, and lovebirds and also in turkey ...
Psoas
Muscles of the lower back (the loin). There are two psoas muscles on each side of the back. The larger of the two is called the psoas major and the smaller the psoas minor. The ...
psomophagia, psomophagy
The practice of swallowing food without thorough mastication. [G. psomos, morsel, bit, + phago, to eat]
psoralen
A phototoxic drug used by topical or oral administration for the treatment of vitiligo and psoriasis. Also present in oil of bergamot perfume and in fruits and vegetables such ...
Psoralen photochemotherapy
A type of therapy in which the patient is exposed first to psoralens (drugs containing chemicals that react with ultraviolet light to cause darkening of the skin) and then to ...
psorenteritis
Inflammatory swelling of the solitary lymphatic follicles of the intestine. [G. psora, itch (scabies), + enteron, intestine, + -itis, inflammation]
Psorergates
A genus of itch mites (family Cheyletidae) parasitic on cattle, sheep, and goats. P. bos is the itch mite of cattle, described in New Mexico; P. ovis is the small itch mite of ...
psoriasiform
Resembling psoriasis.
Psoriasis
: A reddish, scaly rash often located over the surfaces of the elbows, knees, scalp, and around or in the ears, navel, genitals or buttocks. Approximately 10-15% of patients ...
Psoriasis vulgaris
The medical name for the most common form of psoriasis ("vulgaris" means common). About 80% of people with psoriasis have this type. It is also called plaque psoriasis because ...
Psoriasis, erythrodermic
A particularly inflammatory form of psoriasis that often affects most of the body surface. It is the least common form of psoriasis and most commonly appears on people who have ...
Psoriasis, guttate
A type of psoriasis characterized by red, scaly patches of inflamed skin on all parts of the body. It is associated with a lung infection
Psoriasis, pustular
A type of recurring psoriasis characterized by the appearance of pus-filed pimples and sores in clusters. It can be intensely painful,
psoriatic
Relating to psoriasis.
Psoroptes
A genus of itch or mange mites (family Cheyletidae), including the species P. cuniculi (the scab mite of rabbits), P. equi (the mange or body mite of horses), and P. ovis (the ...
PSP
Progressive supranuclear palsy, a neurologic disorder of unknown origin that gradually destroys cells in many areas of the brain, leading to serious and permanent problems with ...
psych-
See psycho-.
psychalgalia
SYN: psychalgia (1).
psychalgia
1. Distress attending a mental effort, noted especially in melancholia. SYN: phrenalgia (1), psychalgalia. 2. SYN: psychogenic pain. [ psych- + G. algos, pain]
psychalia
A rarely used term for an emotional condition characterized by auditory and visual hallucinations.
psychanopsia
SYN: mind blindness. [ psych- + G. an- priv, + opsis, vision]
psychataxia
Mental confusion; inability to fix one's attention or to make any continued mental effort. [ psych- + G. ataxia, confusion]
psyche
Term for the subjective aspects of the mind, self, soul; the psychologic or spiritual as distinct from the bodily nature of persons. [G. mind, soul]
psyche-
See psycho-.
psychedelic
1. Pertaining to a rather imprecise category of drugs with mainly central nervous system action, and with effects said to be the expansion or heightening of consciousness, e.g., ...
Psychiatric
Pertaining to or within the purview of psychiatry, the medical specialty concerned with the prevention, diagnosis, and treatment of mental illness. Psychiatric may refer to ...
Psychiatric trauma
An experience that is emotionally painful, distressful, or shocking and which may result in lasting mental and physical effects. Psychiatric trauma is essentially a normal ...
psychiatrics
SYN: psychiatry.
Psychiatrist
A physician (an M.D.) who specializes in the prevention, diagnosis, and treatment of mental illness. Psychiatrists must receive additional training and serve a supervised ...
Psychiatry
The medical specialty concerned with the prevention, diagnosis, and treatment of mental illness. Psychiatrists are MDs who receive additional training and serve a supervised ...
psychic
1. Relating to the phenomena of consciousness, mind, or soul. SYN: psychical. 2. A person supposedly endowed with the power of communicating with spirits; a spiritualistic ...
psychical
SYN: psychic (1).
psychism
The theory that a principle of life pervades all nature. [G. psyche, soul]
psycho-, psych-, psyche-
The mind; mental; psychologic. [G. psyche, soul, mind]
psycho-oncology
The psychologic aspects of the treatment and management of the patient with cancer; it combines elements of psychiatry, psychology, and medicine with special concern for the ...
psychoacoustics
1. A discipline combining experimental psychology and physics that deals with the physical features of sound as related to audition, as well as with the physiology and ...
psychoactive
Possessing the ability to alter mood, anxiety, behavior, cognitive processes, or mental tension; usually applied to pharmacologic agents.
psychoallergy
A rarely used term for a sensitization to emotionally charged symbols.
psychoanalysis
1. A method of psychotherapy, originated by Freud, designed to bring preconscious and unconscious material to consciousness primarily through the analysis of transference ...
psychoanalyst
A psychotherapist, usually a psychiatrist or clinical psychologist, trained in psychoanalysis and employing its methods in the treatment of emotional disorders.
psychoanalytic
Pertaining to psychoanalysis.
psychoauditory
Relating to the mental perception and interpretation of sounds. See psychoacoustics. [psycho- + L. auditorius, relating to hearing]
psychobiology
1. The study of the interrelationships of the biology and psychology in cognitive functioning, including intellectual, memory, and related neurocognitive processes. 2. Adolf ...
psychocatharsis
SYN: catharsis (2).
psychochrome
A certain color mentally conceived in response to a sense impression. SEE ALSO: psychochromesthesia. [psycho- + G. chroma, color]
psychochromesthesia
A form of synesthesia in which a certain stimulus to one of the special organs of sense produces the mental image of a color. SEE ALSO: photism, color taste, ...
psychodiagnosis
1. Any method used to discover the factors that underlie behavior, especially maladjusted or abnormal behavior. 2. A subspecialty within clinical psychology that emphasizes the ...
Psychodidae
A family of small flies or gnats characterized by hairy mothlike body and the presence of 7–11 long parallel wing veins lacking cross-veins; includes the sandflies, Phlebotomus ...
psychodometry
The measurement of the rapidity of mental action. [psycho- + G. hodos, way, + metron, measure]
psychodrama
A method of psychotherapy in which patients act out their personal problems by spontaneously enacting without rehearsal diagnostically specific roles in dramatic performances ...
psychodynamics
The systematized study and theory of the psychologic forces that underlie human behavior, emphasizing the interplay between unconscious and conscious motivation and the ...
psychoendocrinology
Study of the interrelationships between endocrine function and mental states.
psychoexploration
Study of the attitudes and emotional life of a person.
psychogalvanic
Relating to changes in electric properties of the skin; e.g., a change in skin resistance induced by psychologic stimulus.
psychogalvanometer
A galvanometer that records changes in skin resistance related to emotional stress.
psychogender
The attitudes adopted by a person related to his or her identification as either a male or a female. SEE ALSO: gender role.
psychogenesis
The origin and development of the psychic processes including mental, behavioral, emotional, personality, and related psychologic processes. SYN: psychogeny. [psycho- + G. ...
psychogenic, psychogenetic
1. Of mental origin or causation. 2. Relating to emotional and related psychologic development or to psychogenesis.
psychogeny
SYN: psychogenesis.
psychogeusic
Pertaining to the mental perception and interpretation of taste. [psycho- + G. geusis, taste]
psychogogic
Acting as a stimulant to the emotions. [psycho- + G. agogos, a leading away]
psychographic
Relating to psychography.
psychography
The literary characterization of an individual, real or fictional, that uses psychoanalytic and psychologic categories and theories; a psychologic biography or character ...
psychohistory
The combined use of psychology (especially psychoanalysis) and history in the writing, especially of biography, as in the work of Erik Erikson. SEE ALSO: psychography.
psychokinesis, psychokinesia
1. The influence of mind upon matter, as the use of mental “power” to move or distort an object. 2. Impulsive behavior. [psycho- + G. kinesis, movement]
psycholinguistics
Study of a host of psychological factors associated with speech, including voice, attitudes, emotions, and grammatical rules, that affect communication and understanding of ...
psychologic, psychological
1. Relating to psychology. 2. Relating to the mind and its processes. See psychology.
Psychological child abuse
Also known as emotional child abuse, this is the third most frequently reported form of child abuse (after child neglect and physical child abuse), accounting 17% of all ...
Psychological imprinting
A remarkable genetic phenomenon that occurs in animals, and theoretically humans, in the first hours of life. The newborn creature bonds to the type of animals it meets at birth, ...
psychologist
A specialist in psychology licensed to practice professional psychology ( e.g., clinical p.), or qualified to teach psychology as a scholarly discipline (academic p.), or whose ...
Psychologist, clinical
A professional specializing in diagnosing and treating diseases of the brain, emotional disturbance, and behavior problems. Psychologists can only use talk therapy as treatment; ...
psychology
The profession ( e.g., clinical p.), scholarly discipline (academic p.), and science (research p.) concerned with the behavior of humans and animals, and related mental and ...
Psychology, clinical
A professional specialty concerned with diagnosing and treating diseases of the brain, emotional disturbance, and behavior problems. Psychologists can only use talk therapy as ...
Psychology, social
The study of the mind and mental processes, particularly as regards social interactions, focusing on the ways our actions influence others, and vice versa. Social psychology is a ...
psychometrics
SYN: psychometry.
psychometry
The discipline pertaining to psychological and mental testing, and to any quantitative analysis of an individual's psychological traits or attitudes or mental processes. SYN: ...
psychomotor
1. Relating to the psychologic processes associated with muscular movement and to the production of voluntary movements. 2. Relating to the combination of psychic and motor ...
psychoneuroimmunology
An area of study that focuses on emotional and other psychologic states that affect the immune system, rendering the individual less or more susceptible to disease or the course ...
psychoneurosis
1. A mental or behavioral disorder of mild or moderate severity. 2. Formerly a classification of neurosis that included hysteria, psychasthenia, neurasthenia, and the anxiety ...
psychoneurotic
Pertaining to or suffering from psychoneurosis.
psychonomic
Relating to psychonomy.
psychonomy
A rarely used term referring to the branch of psychology concerned with the laws of behavior. [psycho- + G. nomos, law]
psychonosology
The classification of mental illnesses and behavioral disorders. SYN: psychiatric nosology. [psycho- + G. nosos, disease, + logos, study]
psychonoxious
Rarely used term for: 1. Having an unfavorable effect on the emotional life and reactions mediated by higher levels of the central nervous system; may be endogenous or ...
psychopath
Former designation for an individual with an antisocial type of personality disorder. SEE ALSO: antisocial personality, sociopath. [psycho- + G. pathos, disease]
psychopathic
Relating to or characteristic of psychopathy.
psychopathologist
One who specializes in psychopathology.
psychopathology
1. The science concerned with the pathology of the mind and behavior. 2. The science of mental and behavioral disorders, including psychiatry and abnormal psychology. [psycho- ...
psychopathy
An older and inexact term referring to a pattern of antisocial or manipulative behavior engaged in by a psychopath. SEE ALSO: personality disorder. [psycho- + G. pathos, ...
psychopharmaceuticals
Drugs used in the treatment of emotional disorders.
psychopharmacology
1. The use of drugs to treat mental and psychologic disorders. 2. The science of drug-behavior relationships. SYN: neuropsychopharmacology. [psycho- + G. pharmakon, drug, + ...
psychophysical
1. Relating to the mental perception of physical stimuli. See psychophysics. 2. SYN: psychosomatic.
psychophysics
The science of the relation between the physical attributes of a stimulus and the measured, quantitative attributes of the mental perception of that stimulus ( e.g., the ...
psychophysiologic
1. Pertaining to psychophysiology. 2. Denoting a so-called psychosomatic illness. 3. Denoting a somatic disorder with significant emotional or psychologic etiology.
psychophysiology
The science of the relation between psychologic and physiologic processes; e.g., elements of autonomic nervous system activity activated by emotion.
psychoprophylaxis
Psychotherapy directed toward the prevention of emotional disorders and the maintenance of mental health. [psycho- + prophylaxis]
psychorelaxation
A method of treating anxiety and tension by practicing general bodily relaxation, as in systematic desensitization.
psychormic
SYN: psychostimulant. [psycho- + G. hormao, to set in motion]
psychosensory, psychosensorial
1. Denoting the mental perception and interpretation of sensory stimuli. 2. Denoting a hallucination which by effort the mind is able to distinguish from reality.
psychosexual
Pertaining to the relationships among the emotional, mental physiologic, and behavioral components of sex or sexual development.
psychosine
Galactosylsphingosine, a constituent of cerebrosides, formed from UDPgalactose and sphingosine by UDPgalactose-sphingosine β-d-galactosyltransferase.
Psychosis
In the general sense, a mental illness that markedly interferes with a person's capacity to meet life's everyday demands. In a specific sense, it refers to a thought disorder in ...
Psychosis, ICU
A disorder in which patients in an intensive care unit (ICU) or a similar hospital setting may experience anxiety, become paranoid, hear voices, see things that are not there, ...
Psychosis, intensive care unit
A disorder in which patients in an intensive care unit (ICU) or a similar hospital setting may experience anxiety, become paranoid, hear voices, see things that are not there, ...
Psychosis, schizophrenia
The most chronic and disabling of the major mental illnesses. Schizophrenia may be one disorder, or it may be many disorders, with different causes. Because of the disorder's ...
psychosocial
Involving both psychologic and social aspects; e.g., age, education, marital and related aspects of a person's history.
psychosomatic
Pertaining to the influence of the mind or higher functions of the brain ( e.g., emotions, fears, desires) upon the functions of the body, especially in relation to bodily ...
Psychosomatic illness
The mind influences the body to create or exacerbate illness.
psychosomimetic
SYN: psychotomimetic.
psychostimulant
An agent with antidepressant or mood-elevating properties. SYN: psychormic.
psychosurgery
The treatment of mental disorders by operation upon the brain, e.g., lobotomy.
psychosynthesis
Term for an older style of therapy, posited as the opposite of psychoanalysis, stressing the restoration of useful inhibitions and of the id to its rightful place in relation to ...
psychotechnics
An older term denoting the practical application of psychologic methods in the study of economics, sociology, and other subjects. [psycho- + G. techne, art, skill]
psychotherapeutic
Relating to psychotherapy.
psychotherapeutics
SYN: psychotherapy.
psychotherapist
A person, usually a psychiatrist or clinical psychologist, professionally trained and engaged in psychotherapy. Currently, the term is also applied to social workers, nurses, ...
psychotherapy
Treatment of emotional, behavioral, personality, and psychiatric disorders based primarily upon verbal or nonverbal communication and interventions with the patient, in ...
psychotic
Relating to or affected by psychosis.
psychotogen
A drug that produces psychotic manifestations. [ psychotic + G. -gen, producing]
psychotogenic
Capable of inducing psychosis; particularly referring to drugs of the LSD series and similar substances.
psychotomimetic
1. A drug or substance that produces psychologic and behavioral changes resembling those of psychosis; e.g., LSD. 2. Denoting such a drug or substance. SYN: psychosomimetic. [ ...
psychotropic
Capable of affecting the mind, emotions, and behavior; denoting drugs used in the treatment of mental illnesses. [psycho- + G. trope, a turning]
psychro-
Cold. SEE ALSO: cryo-, crymo-. [G. psychros]
psychroalgia
A painful sensation of cold. [ psychro- + G. algos, pain]
psychroesthesia
1. The form of sensation that perceives cold. 2. A sensation of cold although the body is warm; a chill. [ psychro- + G. aisthesis, sensation]
psychrometer
A device for measuring the humidity of the atmosphere by the difference in temperature between two thermometers, the bulb of one kept moist, the other dry. Evaporation from the ...
psychrometry
The calculation of relative humidity and water vapor pressures from wet and dry bulb temperatures and barometric pressure; whereas relative humidity is the value ordinarily ...
psychrophile, psychrophil
An organism which grows best at a low temperature (0–32°C; 32–86°F), with optimum growth occurring at 15–20°C (59–68°F). [ psychro- + G. phileo, to love]
psychrophilic
Pertaining to a psychrophile. [ psychro- + G. phileo, to love]
psychrophobia
1. Extreme sensitiveness to cold. 2. A morbid dread of cold. [ psychro- + G. phobos, fear]
psychrophore
A double catheter through which cold water is circulated to apply cold to the urethra or another canal or cavity. [ psychro- + G. phoros, bearing]
psyllium seed
The cleaned, dried ripe seed of Plantago indica or of P. ovata. A mild cathartic that acts by absorbing water and providing indigestible mucilaginous bulk for the intestines. ...
PT
Abbreviation for physical therapy, physical therapist, and prothrombin time.
Pt
Symbol for platinum.
PTA
Abbreviation for plasma thromboplastin antecedent; phosphotungstic acid; percutaneous transluminal angioplasty.
PTAH
Abbreviation for phosphotungstic acid hematoxylin.
ptarmic
SYN: sternutatory. [G. ptarmikos, causing to sneeze, fr. ptarmos, a sneezing]
ptarmus
Sneezing. [G. ptarmos, a sneezing]
PTC
Abbreviation for plasma thromboplastin component; phenylthiocarbamoyl.
PTC (percutaneous transhepatic cholangiography)
A test of the bile duct system done by inserting a thin needle through the skin and into the liver (on the right side of the patient's abdomen). Dye is injected through the needle ...
PTCA
Abbreviation for percutaneous transluminal coronary angioplasty.
PTCA (Angioplasty)
Procedure with a balloon-tipped catheter to enlarge a narrowing in a coronary artery. PTCA stands for Percutaneous Transluminal Coronary Angioplasty.
Ptd
Abbreviation for phosphatidyl.
PtdCho
Abbreviation for phosphatidylcholine.
PtdEth
Abbreviation for phosphatidylethanolamine.
PtdIns
Abbreviation for phosphatidylinositol.
PtdIns(4,5)P2
Symbol for phosphatidylinositol 4,5-bisphosphate.
PtdSer
Abbreviation for phosphatidylserine.
PTE
Abbreviation for pulmonary thromboembolism or pulmonary thromboendarterectomy.
PTEA
Abbreviation for pulmonary thromboendarterectomy.
pter-, ptero-
Combining form meaning wing; feather. [G. pteron, wing, feather]
pteridine
Azinepurine; benzotetrazine; pyrazino[2,3-d]pyrimidine; a two-ring heterocyclic compound found as a component of pteroic acid and the pteroylglutamic acids (folic acids, ...
pterin
Term loosely used for any of the compounds containing pteridine; specifically, 2-amino-4-hydroxypteridine. Some pteridines ( e.g., xanthopterin, leucopterin) still retain the p. ...
pterion
A craniometric point in the region of the sphenoid fontanelle, at the junction of the greater wing of the sphenoid, the squamous temporal, the frontal, and the parietal bones; ...
pteroic acid
A constituent of folic acid, containing p-aminobenzoic acid and pteridine linked by a –CH2– group between the amino group of the former and C-6 of the latter.
pteropterin
A folic acid conjugate, a principle chemically similar to folic acid except that it contains three molecules of glutamic acid instead of one, in γ linkage. SYN: fermentation ...
pteroylmonoglutamic acid
SYN: folic acid (2).
pteroyltriglutamic acid
SYN: pteropterin.
Pterygium
A winglike triangular membrane. Although a pterygium can be anywhere, including behind the knee, it commonly refers to a winglet of the conjunctiva. This pterygium may extend ...
pterygo-
Wing-shaped, usually relating to the pterygoid process. [G. pteryx, pterygos, wing]
pterygoid
Wing-shaped; resembling a wing; a term applied to various anatomical parts relating to the sphenoid bone. [G. pteryx (pteryg-), wing, + eidos, resemblance]
pterygomandibular
Relating to the pterygoid process and the mandible.
pterygomaxillare
The point where the pterygoid process of the sphenoid bone and the pterygoid process of the maxilla begin to form the pterygomaxillary fissure; the lowest point of the opening ...
pterygomaxillary
Relating to the pterygoid process and the maxilla.
pterygopalatine
Relating to the pterygoid process and the palatine bone.
PTF
Abbreviation for plasma thromboplastin factor.
PTH
Abbreviation for parathyroid hormone; phenylthiohydantoin.
PTHC
Abbreviation for percutaneous transhepatic cholangiography.
pthiriasis
SYN: pediculosis pubis. [G. phtheiriasis, fr. phtheir, a louse] - p. pubis presence of crab lice in the pubis and other hairy areas of the trunk, and in the eyelashes of ...
Pthirus
A genus of lice (family Pediculidae) formerly grouped in the genus Pediculus. The main species is P. pubis (formerly Pediculus pubis), the crab or pubic louse, a parasite ...
PTHrP
Abbreviation for parathyroid hormone-related peptide.
PTK
Acronym for phototherapeutic keratectomy.
PTMA
Abbreviation for phenyltrimethylammonium.
ptomaine
An indefinite term applied to poisonous substances, e.g., toxic amines, formed in the decomposition of protein by the decarboxylation of amino acid s by bacterial action. SYN: ...
ptomainemia
A condition resulting from the presence of a ptomaine in the circulating blood. [ ptomaine + G. haima, blood]
ptomatine
SYN: ptomaine.
ptomatropine
A ptomaine characterized by poisonous properties similar to those of atropine; formed by the action of bacteria in the decarboxylation of amino acid s.
ptosed
SYN: ptotic.
Ptosis
Downward displacement. Ptosis of the eyelids is drooping of the eyelids. * * * 1. A sinking down or prolapse of an organ. 2. SYN: blepharoptosis. [G. p., a falling] - p. ...
Ptosis of the eyelids, adult
Drooping of the upper eyelids in adults, most commonly due to separation of the tendon of the lid-lifting (levator) muscle from the eyelid. This may occur with age, after cataract ...
Ptosis of the eyelids, congenital
Drooping of the upper eyelids at birth. The lids may droop only slightly or they may cover the pupils and restrict or even block vision. Moderate or severe ptosis calls for ...
ptotic
Relating to or marked by ptosis. SYN: ptosed.
PTT
Abbreviation for partial thromboplastin time.
PTU
Propylthiouracil, an antithyroid medication, a drug that blocks the production of thyroid hormone by the thyroid gland. PTU is used to treat hyperthyroidism in order to reduce ...
ptyal-, ptyalo-
The salivary glands, saliva. SEE ALSO: sialo-. [G. ptyalon]
ptyalagogue
SYN: sialagogue.
ptyalectasis
SYN: sialectasis. [ptyal- + G. ektasis, a stretching out]
ptyalin
SYN: α-amylase.
ptyalism
SYN: sialorrhea. [G. ptyalismos, spitting]

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