Fetal malformation involving two or more imperfect and partially fused bodies. [poly- + G. soma, body]
Pertaining to or characterized by polysomy.
The recorded physiologic function(s) obtained in polysomnography. [poly- + L. somnus, sleep, + G. gramma, diagram]
Simultaneous and continuous monitoring of relevant normal and abnormal physiologic activity during sleep. [poly- + L. somnus, sleep, + G. grapho, to write]
State of a cell nucleus in which a specific chromosome is represented more than twice. Cells containing three, four, or five homologous chromosomes are referred to, respectively, ...
A mixture of polyoxethylene ethers of mixed partial oleic esters of sorbitol anhydrides; used as an emulsifier, as in the preparation of pharmacologic products.
The entrance of more than one spermatozoon into the ovum. SYN: polyspermia (1), polyspermism.
A condition in which splenic tissue is divided into nearly equal masses or totally absent; congenital heart disease and malposition and maldevelopment of abdominal organs are ...
A rarely used term for behavior characterized by its socially provocative quality.
Arrangement of the eyelashes in two or more rows. [poly- + G. stichos, row]
A colloid system of solid phases having different degrees of dispersion.
Malformation of the hand or foot in which the shortened digits are syndactylous and polydactylous. [poly- + symbrachydactyly]
Referring to neural pathways formed by a chain of a large number of synaptically connected nerve cells, as distinguished from oligosynaptic conduction systems. SYN: ...
Syndactyly of several fingers or toes. There are several forms: a simple one [MIM*174700] and one with abnormal skull shape, Grieg cephalopolysyndactyly syndrome [MIM*175700], ...
Consisting of many filaments of chromatin as the result of repeated division of chromonema without separation of filaments.
Acyclic polymers containing a large number of isoprene subunits, usually unsaturated. SYN: polyisoprenes, polyisoprenoids.
Presence of supernumerary nipples, either on the breast or elsewhere on the body. SYN: hyperthelia. [poly- + G. thele, nipple]
A diuretic and antihypertensive of the benzothiadiazine group.
Producing multiple young at a birth. [poly- + G. tokos, birth]
Body section radiography using a machine designed to effect complex hypocycloidal motion; images a thinner tissue plane than does simple linear or circular tomography.
Excessive hairiness. SYN: polytrichosis. [poly- + G. thrix (trich-), hair]
Exhibiting an attraction, trophism, for multiple organs; usually used for a virus that affects multiple organ systems.
SYN: polyonychia. [poly- + L. unguis, nail]
The passage of an abnormally large amount of urine. Someone with polyuria passes too much urine and so may have frequency, the need to urinate frequently. Polyuria is a "classic ...
Polymers of uronic acids ( e.g., glucuronic acid, galacturonic acid); the pectins are p..
1. SYN: multivalent. 2. Pertaining to a p. antiserum.
Referring to a compound containing a number of vinyl groups in polymerized form.
A compound, CH2(CHOH)n, that is soluble in water; an adhesive and emulsifier.
A substance used as a rubber substitute in many industrial applications and suspected of being carcinogenic in humans. SYN: chlorethene homopolymer.
Segmented body form, as in the higher tapeworms, subclass Cestoda. SEE ALSO: strobila, monozoic.
SYN: polyovulatory. [poly- + G. zygotos, yoked]
An ointment or cream containing medicaments; usually used on the hair. SYN: pomatum. [Fr. p., fr. L. pomum, apple]
Abbreviation for proopiomelanocortin.
Fruit of Punica granatum (family Punicaceae), a reddish yellow fruit the size of an orange, containing many seeds enclosed in a reddish acidic pulp; used in diarrhea for its ...
Ralph H., U.S. obstetrician-gynecologist, 1867–1925. See P. operation.
Abbreviation for Purinethol (6-mercaptopurine), Oncovin (vincristine sulfate), methotrexate, and prednisone, a cancer chemotherapy regimen.
J.C., 20th century Dutch physician. See P. disease.
A genetic (inherited) deficiency of an enzyme called acid alpha glucosidase. This enzyme helps the body break down glycogen, a complex carbohydrate that is converted to glucose ...
SYN: dyshidrosis. [G. a bubble, fr. pomphos, a blister]
ponceau de xylidine
A monoazo acid dye originally employed as a red histologic counterstain in Masson trichrome stain.
Emil, German pathologist, 1844–1913. See P. shadow.
Bodily exertion, fatigue, overwork, pain. [G. ponos, toil, fatigue, pain]
An instrument for recording graphically the progressive fatigue of a contracting muscle. [ pono- + G. grapho, to write]
Rarely used term for a condition of irritable heart in which palpitation is excited by slight exertion. [ pono- + G. palmos, palpitation]
Morbid fear of overwork or of becoming fatigued. [ pono- + G. phobos, fear]
A disease occurring in young children in certain of the islands of Greece, characterized by enlargement of the spleen, hemorrhages, fever, and cachexia; possibly the infantile ...
A specific section of the brain formed by the rounded prominence on the front surface of the brainstem. (The brainstem is the lowest part of the brain that merges with the spinal ...
An artificial tooth on a fixed partial denture; it replaces the lost natural tooth, restores its functions, and usually occupies the space previously occupied by the natural ...
A vertical ridge on the eminentia conchae giving insertion to the auricularis posterior muscle. [L. dim. of pons, bridge]
- p. hepatis SYN: pons hepatis.
- p. nasi bridge of the ...
Those areas of the cerebellar cortex that receive input from cells of the basilar pontine nuclei; includes all cortical regions; projections to the hemisphere greater than to the ...
Eugene H., U.S. surgeon, 1874–1949. See P. phenomenon, P.- Schlesinger sign.
1. A collection of blood or other fluid in any region of the body; p. of blood results from dilation and retardation of the circulation in the capillaries and veins of the ...
The sum total of genes, with all their variations, possessed by a particular species at a particular time. (Not something to dive into.)
SYN: popliteal fossa. SEE ALSO: popliteal fossa. [L. the ham of the knee]
Relating to the p. fossa. SYN: popliteus (1).
1. SYN: popliteal. 2. SYN: popliteal fossa. 3. SYN: p. (muscle). [L.]
Abbreviation for 1,4-bis(5-phenyloxazol-2-yl)benzene, a liquid scintillator.
- p. oil a fixed (drying) oil expressed from the seed of Papaver somniferum; sometimes used in the preparation of liniments and as a solvent of iodine in iodized ...
Statistical term denoting all the objects, events, or subjects in a particular class. Cf.:sample. [L. populus, a people, nation]
Abbreviation for problem-oriented record.
A powder composed of a clay, silica, and a flux that, when mixed with water, forms a paste that is molded to form artificial teeth, inlays, jacket crowns, and dentures. When ...
Calcification of the wall of the gallbladder. The gallbladder looks on ultrasound, abdominal X-ray and computed tomography (CT) as if it were made of " porcelain." The ...
Having to do with swine. From the Latin "porcus" meaning "pig." Porcine insulin is obtained from pig pancreas. A porcine skin graft is one in which pig skin is used, usually just ...
1. An opening, hole, perforation, or foramen. A p., meatus, or foramen. SEE ALSO: opening. 2. SYN: sweat p.. SEE ALSO: opening, meatus, foramen. [G. poros, passageway]
Relating to or characterized by porencephaly. SYN: porencephalous.
Chronic inflammation of the brain with the formation of cavities in the organ's substance. [G. poros, pore, + enkephalos, brain, + -itis, inflammation]
A disorder of the central nervous system involving a cyst or cavity in a cerebral hemisphere of the brain. The cysts or cavities are usually the remnants of destructive lesions, ...
Otto, Austrian bacteriologist, 1879–1968. See P. method, P.- Meier test.
The sponges; a phylum of the Metazoa, comprising a group of sessile, aquatic animals possessing an endoskeleton and many branching canals, lined by flagellated collar cells; ...
Proteins found in the outer membrane of a double membrane that allow permeability in most small molecules. [G. poros, passageway, + -in]
A morbid impulse to wander or journey away from home. [G. poreia, a journey, + mania, frenzy]
The central point on the upper margin of the external auditory meatus; as a cephalometric landmark, it is located in the middle of the metal rods of the cephalometer. [G. poros, a ...
Taenia solium (also called the armed tapeworm or the measly tapeworm), a worm contracted from undercooked or measly pork, pork infected with the larval forms of the tapeworm. ...
Pork tapeworm infection
Known medically as cysticercosis, an infection caused by Taenia solium (the pork tapeworm). Infection occurs when the tapeworm larvae enter the body and form cysticerci ...
Acronym for progressive outer retinal necrosis.
A rarely used term for sexual attraction toward prostitutes. [G. porne, prostitute, + lagneia, lust]
1. A pore, a duct, an opening. [G. poros (L. porus), passageway] 2. A going through, a passing through. [G. poreia, a journey, passage] 3. A callus; an induration. [G. poros, ...
Infection with a species of the tongue worms Porocephalus. SYN: porocephalosis.
A family of parasitic tongue worms (order Porocephalida, phylum Pentastomida) characterized by four hooks arranged in a curved line on either side of the mouth. Adults are found ...
A genus of tongue worms of the family Porocephalidae, of which the adult worms or larvae cause porocephaliasis in a number of animal species, including humans. [G. poros, pore, ...
In fungi, a conidium produced through the microscopic pore of the conidiophore. SYN: porospore.
A rare dermatosis in which there is a thickening of the stratum corneum with an annular keratotic rim or cornoid lamella surrounding progressive centrifugal atrophy; ...
1. SYN: callosity. 2. SYN: exostosis. 3. Induration following a phlegmon. 4. A tumor of cells lining the skin openings of sweat glands. [G. p., callus, fr. poros, stone]
A porous condition. SYN: porosity (1). [L. porosus, porous]
- cerebral p. a porous condition of the brain caused by postmortem growth of Clostridium perfringens or other ...
1. SYN: porosis. 2. A perforation. [G. poros, pore]
Porous, as in osteoporotic.
Having openings that pass directly or indirectly through the substance.
The unsubstituted cyclic tetrapyrrole nucleus that is the basis of the porphyrins. SEE ALSO: porphyrins. Cf.:chlorin, phorbin, corrin. SYN: porphyrin.
General term denoting intermediates between the monopyrrole, porphobilinogen, and the cyclic tetrapyrrole of heme (a porphin derivative). SEE ALSO: bilin.
A porphyrin precursor of porphyrinogens, porphyrins, and heme; found in the urine in large quantities in cases of acute or congenital porphyria.
- p. synthase a liver enzyme ...
Any of a group of inherited diseases characterized by skin sensitivity to sunlight and/or by intermittent acute attacks of abdominal and nerve pain. The porphyrias are caused by ...
Porphyria cutanea tarda
Literally, the late skin form of porphyria, a genetic photosensitive (light-sensitive) skin disease with onset in adult life with substances called uroporphyrins in the urine ...
Intermediates in the biosynthesis of heme, as follows: four porphobilinogens condense to form uroporphyrinogens I and III (giving rise to side products uroporphyrins I and III) ...
A syndrome that results from abnormal porphyrin metabolism such as acute porphyria. SYN: porphyrism. [ porphyrin + G. pathos, disease]
Pigments widely distributed throughout nature ( e.g., heme, bile pigments, cytochromes) consisting of four pyrroles joined in a ring (porphin) structure. They are substitution ...
Excretion of porphyrins and related compounds in the urine. SYN: porphyruria, purpurinuria.
A genus of small anaerobic Gram-negative nonmotile cocci and usually short rods that produce smooth, gray to black pigmented colonies the size of which varies with the species. In ...
Edoardo, Italian obstetrician, 1842–1902. See P. hysterectomy.
- ancillary ports during endoscopic surgery, the placement of more than one entry site to allow insertion of instruments other than the endoscope.
A long-term central venous catheter with subcutaneous port(s). [brand name]
A mark on the skin that resembles port wine (porto) in its rich ruby red color. Due to an abnormal aggregation of capillaries, a port-wine stain is a type of hemangioma. it ...
1. SYN: hilum (1). 2. SYN: interventricular foramen. [L. gate]
- p. hepatis [TA] a transverse fissure on the visceral surface of the liver between the caudate and quadrate ...
Concerning the portal vein and the inferior vena cava.
1. Relating to any porta or hilus, specifically to the porta hepatis and the p. vein. 2. The point of entry into the body of a pathogenic microorganism. SYN: port. [L. portalis, ...
A large vein that carries blood from the stomach and the intestines to the liver. The portal vein is formed by the union of the splenic and superior mesenteric veins. It conveys ...
Curt C., U.S. biochemist, *1914. See P.- Silber chromogens, under chromogen, P.- Silber reaction, P.- Silber chromogens test.
Thomas C., British scientist, 1860–1933. See ...
A part. [L. portion]
- p. intermedia SYN: intermediate nerve.
- p. major nervi trigemini SYN: sensory root of trigeminal nerve.
- p. minor nervi trigemini SYN: motor root of ...
Part or division.
- accessory p. of spinal accessory nerve SYN: cranial root of accessory nerve.
- anterior p. of left medial segment IV of liver [TA] the part of the medial ...
The union of the choroid plexus of the lateral ventricle with that of the third ventricle at the interventricular foramen (of Monro).
Portal. [L. porta, gate]
Relating to the portal vein, biliary ducts, and hepatic artery, which have similar distributions. SEE ALSO: portal triad.
An operation for biliary atresia in which a Roux-en-Y loop of jejunum is anastomosed to the hepatic end of the divided extravascular portal structures, including rudimentary ...
Radiographic record of portography. [ porto- + G. gramma, a writing]
Delineation of the portal circulation by radiography, using radiopaque material, usually introduced into the spleen or into the portal vein at operation. SYN: portovenography. [ ...
Relating to connections between the portal and systemic venous systems.
SYN: sweat pore. SEE ALSO: opening. [L. fr. G. poros, passageway]
- p. acusticus externus [TA] SYN: external acoustic pore.
- p. acusticus internus SYN: internal acoustic ...
Alejandro, Argentinian parasitologist, 1870–1902. See P. disease.
1. An attitude, posture, or place occupied. 2. Posture or attitude assumed by a patient for comfort and to facilitate the performance of diagnostic, surgical, or therapeutic ...
Cloning a gene based simply on knowing its position in the genome without any idea of the function of that gene. Because this is the reverse of how things have been traditionally ...
A resilient elastoplastic or rubber removable appliance fitting over the occlusal surface of the teeth, to obtain limited tooth movement and/or stabilization, usually used at ...
1. Affirmative; definite; not negative. 2. Denoting a response, the occurrence of a reaction, or the existence of the entity or condition in question. 3. Having a value greater ...
Gravity or acceleration in the usual head-to-foot direction in flying or in standing upright; the reverse of negative G.
Positive pressure ventilation
The provision of oxygen under pressure by a mechanical respirator, a machine designed to improve the exchange of air between the lungs and the atmosphere. The device is basically ...
A result that is erroneously positive when a situation is normal. An example of a false positive: a particular test designed to detect cancer of the toenail is positive but the ...
A subatomic particle of mass and charge equal to the electron but of opposite ( i.e., positive) charge. SYN: positive electron.
Positron Emission Tomography (PET)
A tool used to diagnose brain functions and disorders. PET produces three-dimensional, colored images of chemicals or substances functioning within the body. These images are ...
The branch of pharmacology and therapeutics concerned with a determination of the doses of remedies; the science of dosage. [G. posos, how much, + logos, study]
In dentistry, a dowel or pin inserted into the root canal of a natural tooth as an attachment for an artificial crown.
After, behind, posterior; opposite of anti-. Cf.:meta-. [L. post]
A treatment administered following exposure to a harmful agent which attempts to block or reduce injury or infection. Prophylaxis means a defense or protection. Post-exposure ...
Post-polio muscular atrophy (PPMA)
Belated muscle wasting that occurs as part of the post-polio syndrome (PPS), a constellation of symptoms and signs that appear late, from 20 to 40 years after the initial polio ...
Overly mature, overly developed, especially as regards a baby that has not been born until well after the usual term pregnancy. A post-term baby is one born 2 weeks (14 days) or ...
An anxiety disorder that develops in some individuals who have had major traumatic experiences. The person is typically numb at first but later has symptoms including depression, ...
Post-traumatic stress disorder
A common anxiety disorder that develops after exposure to a terrifying event or ordeal in which grave physical harm occurred or was threatened. Family members of victims also can ...
1. Posterior to the axis of the body or any limb, the latter being in the anatomic position. 2. Denoting the portion of a limb bud that lies caudal to the axis of the limb : the ...
Relating to the inferior vena cava.
Referring to the cerebral convolution forming the posterior bank of the central sulcus : the p. gyrus.
After a meal or the taking of food. [L. cibum, food]
Posterior to the heart. [L. cor (cord-), heart]
A crown, replacing the natural crown, which is retained on the stump of the root of a tooth from which the pulp has been removed, by a post or pin integral with the crown and ...
On or in the posterior or dorsal part of the forearm.
SYN: posterior palatal seal.
Following the dicrotic wave in a sphygmogram; denoting an additional variation in the descending line of the pulse tracing.
The period of increasing consciousness between sound sleep and waking. [L. dormio, to sleep]
Relating to that part of the aorta distal to the aortic opening of the ductus arteriosus.
1. After, in relation to time or space. 2. [NA] In human anatomy, denoting the back surface of the body. Often used to indicate the position of one structure relative to ...
Posterior (anatomic orientation)
The back, as opposed to the anterior. In anatomy, certain terms are used to denote orientation. For example, such-and-such a structure may be horizontal, as opposed to vertical. ...
The space in the eye behind the iris and in front of the lens. (The iris is the colored ring of tissue that regulates the amount of light entering the eye by adjusting the size of ...
Posterior cruciate ligament (PCL)
The knee joint is surrounded by a joint capsule with ligaments strapping the inside and outside of the joint (collateral ligaments) as well as crossing within the joint (cruciate ...
The back portion of the pituitary, a small gland in the head called the master gland. The posterior pituitary secretes the hormone oxytocin which increases uterine contractions ...
Posterior; at the back of. [L. posterior]
A term denoting the direction of view or progression, from posterior to anterior, through a part.
Posteroanterior (anatomic orientation)
From back to front, as opposed to anteroposterior. A chest x-ray taken with the chest against the film plate and the x-ray machine behind the patient is a posteroanterior (PA) ...
In anatomy, posteroanterior (PA) means from back-to-front. For example, a PA X-ray of the chest is taken from back-to-front. PA in this respect is the opposite of AP, which ...
Behind and to one side, specifically to the outer side. SYN: posteroexternal.
Behind and to the inner side. SYN: posterointernal.
Relating to the posterior portion of the parietal lobe of the cerebrum.
Relating to or lying in the posterior portion of the temporal lobe of the cerebrum.
The period in the estrus cycle following estrus; characterized by the growth of the corpus luteum and physiologic changes related to the production of progesterone.
Distal to or beyond a ganglion; referring to the unmyelinated nerve fibers originating from cells in an autonomic ganglion. SYN: neurofibrae postganglionicae.
Localized pain in the area of involvement of shingles that persists beyond one month. The most common complication of shingles is postherpetic neuralgia. This occurs when the ...
Dorsal slit of foreskin. [G. posthe, prepuce, + tome, incision]
Surgical reconstruction of the prepuce. [G. posthion, dim. form of posthe, prepuce, + plastos, formed]
Inflammation of the prepuce (the foreskin of the penis). In the uncircumcised male, posthitis and balanitis (inflammation of the glans, the rounded head of the penis) usually ...
SYN: preputial calculus. [G. posthe, prepuce, + lithos, stone]
Following hypnotism; denoting an act suggested during hypnosis that is to be carried out at some time after the hypnotized subject is awakened.
Following a seizure, e.g., epileptic.
SYN: posterior (2). [L. fr. post, after]
Referring to a fetus that remains in the uterus longer than the normal gestational period; i.e., longer than 42 weeks (288 days) in humans.
A baby born 2 weeks (14 days) or more after the usual 9 months (280 days) of gestation. The gestation (length of the pregnancy) is calculated from the date of the last menstrual ...
Overly mature, overly developed, especially as regards a baby. A baby born 2 weeks (14 days) or more after the usual 9 months (280 days) of gestation. The gestation (length of the ...
1. Posterior to the mediastinum. 2. Relating to the posterior mediastinum.
After the menopause. Postmenopausal is defined formally as the time after which a woman has experienced twelve (12) consecutive months of amenorrhea (lack of menstruation) — ...
Postmenopausal cervical kyphosis
An outward curvature (kyphosis) of the cervical vertebrae (the bones of the neck), creating a hump at the back of the neck. This condition, once thought to be a characteristic ...
A small accessory appendage attached to the side of the fifth finger or toe; it may resemble a normal digit or be merely a fleshy mass. [ post- + L. minimus, smallest (finger)]
1. Pertaining to or occurring during the period after death. 2. Colloquialism for autopsy (1). [ post- + L. acc. case of mors (mort-), death]
An autopsy. Also called a necropsy. Postmortem examinations have been done for more than 2,000 years but during most of this time they were rarely done, and then only for legal ...
Relating to the posterior nares or choanae.
1. Posterior to the nasal cavity. 2. Relating to the posterior portion of the nasal cavity.
Occurring after birth. [L. natus, birth]
Subsequent to the death of a tissue or part of the body.