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Medical Dictionary


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pertechnetate (per-tek-ne-tat)
Anionic form of technetium used widely in nuclear scanning; 99mTcO4.

Perthes
Georg C., German surgeon, 1869–1927. See P. disease, P. test, Calvé-P. disease, Legg-Calvé-P. disease.

perthio-
Prefix denoting substitution of sulfur for every oxygen in a compound; e.g., perthiocarbonic acid, H2CS3.

Pertik
Otto, Hungarian pathologist, 1852–1913. See P. diverticulum.

per tubam (per too′bam)
Through a tube. [L.]

pertussis (per-tus′is)
An acute infectious inflammation of the larynx, trachea, and bronchi caused by Bordetella p.; characterized by recurrent bouts of spasmodic coughing that continues until the breath is exhausted, then ending in a noisy inspiratory stridor (the “whoop”) caused by laryngeal spasm. SYN: p. syndrome, whooping cough. [L. per, very (intensive), + tussis, cough]

Peruvian bark
SYN: cinchona.

pervaporation (per′vap-or-a′shun)
The heating of a liquid within a dialyzing bag suspended over a hot plate, evaporation taking place rapidly through the membrane; any colloids in solution remain within the bag while crystalloids diffuse out and crystallize on the outer surface of the bag (perstillation). [L. per, through, + vapor, steam]

perversion (per-ver′zhun)
A deviation from the norm, especially concerning sexual interests or behavior. [L. perversio, fr. per-verto, pp. -versus, to turn about] polymorphous p. 1. in psychoanalytic theory, a child's variegated sexual activity and interests; 2. in general, the manifold perversions shown by an adult. sexual p. SYN: sexual deviation.

pervert (per′vert)
One who practices perversions. SEE ALSO: deviant (2) .

perverted (per-ver′ted)
Abnormal, deviant, or disordered.

per vias naturales (per vi′as nach′er-a′lez)
Through the natural passages; e.g., denoting a normal delivery, as opposed to cesarean section, or the passage in stool of a foreign body instead of its surgical removal. [L.]

pervious (per′ve-us)
SYN: permeable. [L. pervius, fr. per, through, + via, a way]

pes, gen. pedis, pl .pedes (pes, pe′dis, -dez)
1. [TA] SYN: foot (1) . 2. Any footlike or basal structure or part. 3. Talipes. In this sense, p. is always qualified by a word expressing the specific type. [L.] p. abductus SYN: talipes valgus. p. adductus SYN: talipes varus. p. anserinus 1. SYN: parotid plexus of facial nerve. 2. the combined tendinous expansions of the sartorius, gracilis, and semitendinosus muscles at the medial border of the tuberosity of the tibia. p. cavus SYN: talipes cavus. p. equinovalgus SYN: talipes equinovalgus. p. equinovarus SYN: talipes equinovarus. p. gigas SYN: macropodia. p. hippocampi [TA] SYN: foot of hippocampus. p. planus a condition in which the longitudinal arch is broken down, the entire sole touching the ground. SYN: flatfoot, talipes planus. p. pronatus SYN: talipes valgus. p. valgus SYN: talipes valgus. p. varus SYN: talipes varus.

pescovegetarian
A vegetarian who consumes dairy products, eggs, and fish, but does not consume other animal flesh.

pessary (pes′a-re)
1. An appliance of varied form, introduced into the vagina to support the uterus or to correct any displacement. 2. A medicated vaginal suppository. [L. pessarium, fr. G. pessos, an oval stone used in certain games] cube p. plastic or rubber p. in a cube shape particularly suitable for elderly women with uterine prolapse. diaphragm p. a ring with a covered opening, used as a platform to support uterus, bladder, or rectum. doughnut p. SYN: ring p.. Dumontpallier p. an elastic ring p.. SYN: Mayer p.. Gariel p. a hollow inflatable rubber p. made in the form of a ring or a pear. Hodge p. a double-curve oblong p. employed for the correction of retrodeviations of the uterus. Mayer p. SYN: Dumontpallier p.. Menge p. a ring p. with a central horizontal bar into which a detachable handle is inserted. ring p. a ring of rubber, plastic, or metal in which the cervix rests; designed to support the uterus and to correct prolapse of that organ. SYN: doughnut p..

pessimism (pes′i-mizm)
A tendency to see or anticipate the worst. [L. pessimus, worst, irreg. superl. of malus, bad] therapeutic p. a disbelief in the curative virtues of remedies in general and especially of drugs.

pest
SYN: plague (2) . [L. pestis]

pesticemia (pes-ti-se′me-a)
Bacteremia due to Yersinia pestis. [L. pestis, plague, + G. haima, blood]

pesticide (pes′ti-sid)
General term for an agent that destroys fungi, insects, rodents, or any other pest.

pestiferous (pes-tif′e-rus)
SYN: pestilential.

pestilence (pes′ti-lens)
1. SYN: plague (2) . 2. A virulent outbreak of any disease. [L. pestilentia]

pestilential (pes-ti-len′shal)
Relating to or tending to produce a pestilence. SYN: pestiferous.

pestis
SYN: plague (2) . [L.] p. ambulans SYN: ambulant plague. p. bubonica (pes′tis boo′bon′ik-a) SYN: bubonic plague. p. fulminans SYN: bubonic plague. p. major SYN: bubonic plague. p. minor SYN: ambulant plague. p. siderans SYN: septicemic plague.

Pestivirus (pes′ti-vi′rus)
A genus of viruses (family Flaviviridae) composed of the hog cholera virus and related viruses. [L. pestis, plague, + virus]

pestle (pes′l)
An instrument in the shape of a rod with one rounded and weighted extremity, used for bruising, breaking, grinding, and mixing substances in a mortar. [L. pistillum, fr. pinso, or piso, to pound]

PET
Abbreviation for positron emission tomography.

peta- (P)
Prefix used in the SI and metric system to signify multiples of one quadrillion (1015).

-petal
Seeking; movement toward the part indicated by the main portion of the word. [L. peto, to seek, strive for]

petechiae, gen. petechia (pe-te′ke-e, pe-tek′-; pe-te′ke-a)
Minute hemorrhagic spots, of pinpoint to pinhead size, in the skin, which are not blanched by pressure. [Mod. L. form of It. petecchie] calcaneal p. traumatic hemorrhage into the stratum corneum of the heel that may persist for several weeks as centrally confluent black dots. SYN: black heel. Tardieu p. SYN: Tardieu ecchymoses, under ecchymosis.

petechial (pe-te′ke-al, pe-tek′-)
Relating to, accompanied by, or characterized by petechiae.

Peters
Hubert, Austrian obstetrician, 1859–1934. See P. ovum.

Peters
Albert, German physician, 1862–1938. See P. anomaly.

Petersen
C.F., German surgeon, 1845–1908.

pethidine (peth′i-den)
SYN: meperidine hydrochloride.

petiolate, petiolated (pet′e-o-lat, -lat-ed)
Having a stem or pedicle. SYN: petioled. [L. petiolus]

petiole (pet′e-ol)
SYN: petiolus.

petioled (pet′e-old)
SYN: petiolate.

petiolus (pe-ti′o-lus)
A stem or pedicle. SYN: petiole. [L. dim. of pes (foot), the stalk of a fruit] p. epiglottidis SYN: stalk of epiglottis.

Petit
Jean L., Paris surgeon, 1674–1750. See P. hernia, P. herniotomy, P. lumbar triangle.

Petit
Francois du, French surgeon and anatomist, 1664–1741. See P. canals, under canal, P. sinus.

Petit
Paul, French anatomist, *1889. See P. aponeurosis.

Petit
Alexis T., French physicist, 1791–1820. See Dulong-P. law.

Petri
Julius, German bacteriologist, 1852–1921. See P. dish, P. dish culture.

petrifaction (pet-ri-fak′shun)
Fossilization, as in conversion into stone. [L. petra, rock + facio, to make]

pétrissage (pa-tre-sazh′)
A manipulation in massage, consisting in a kneading of the muscles. [Fr. kneading]

petro-
Stone; stone-like hardness. [L. petra, rock; G. petros, stone]

petroccipital (pet′rok-sip′i-tal)
SYN: petrooccipital.

petrolatum (pet-ro-la′tum)
A yellowish mixture of the softer members of the paraffin or methane series of hydrocarbons, obtained from petroleum as an intermediate product in its distillation; used as a soothing application to burns and abrasions of the skin and as a base for ointments. SYN: petroleum jelly, yellow soft paraffin. heavy liquid p. SYN: mineral oil. hydrophilic p. p. composed of cholesterol 30 g, stearyl alcohol 30 g, white wax 80 g, and white p. 860 g, to make 1000 g. light liquid p. light mineral oil. white p. of the same composition as p. except that it is decolorized by treatment with activated charcoal; used for the same purposes as p.. SYN: white soft paraffin.

petroleum (pe-tro′le-um)
A mixture of liquid hydrocarbons found in the earth in various parts of the world and believed to be derived from fossilized animal and plant remains; the source of petrolatum, in addition to its use for lighting and heating purposes. SYN: coal oil, rock oil. [L. petra, rock, + oleum, oil] p. benzin purified, low boiling fractions distilled from p. consisting of hydrocarbons, chiefly of the methane series; it is highly flammable, and its vapors, when mixed with air and ignited, may explode; used as a solvent. SYN: benzin, benzine, naphtha, p. ether. p. ether SYN: p. benzin. liquid p. SYN: mineral oil.

petroleum jelly
SYN: petrolatum.

petromastoid (pet′ro-mas′toyd)
Relating to the petrous and the squamous portions of the temporal bone, which are usually united at birth by the petrosquamosal suture. SYN: petrosomastoid.

petrooccipital (pet′ro-ok-sip′i-tal)
Denoting the cranial suture between the occipital bone and the petrous portion of the temporal. SYN: petroccipital.

petropharyngeus
See musculus p..

petrosa, pl .petrosae (pe-tro′sa, -se)
The petrous portion of the temporal bone. [L. fr. petra, rock]

petrosal (pe-tro′sal)
Relating to the petrosa. SYN: petrous (2) .

petrosalpingostaphylinus (pet′ro-sal′pin-go-staf-i-li′nus)
Obsolete term for the levator veli palatini muscle. [petrosa + G. salpinx, trumpet, + staphyle, uvula]

petrositis (pet-ro-si′tis)
An inflammation involving the petrous portion of the temporal bone and its air cells. SYN: petrousitis.

petrosomastoid (pet-ro′so-mas′toyd)
SYN: petromastoid.

petrosphenoid (pet′ro-sfe′noyd)
Relating to the petrous portion of the temporal bone and to the sphenoid bone.

petrosquamosal, petrosquamous (pet′ro-skwa-mo′sal, -skwa′mus)
Relating to the petrous and the squamous portions of the temporal bone. SYN: squamopetrosal.

petrostaphylinus (pet′ro-staf-i-li′nus)
Obsolete term for the levator veli palatini (muscle). [G. petra, stone, + staphyle, uvula]

petrous (pet′rus, pe′trus)
1. Of stony hardness. 2. SYN: petrosal. [L. petrosus, fr. petra, a rock]

petrousitis (pet-roo-si′tis)
SYN: petrositis.

Pette
H.H. German neuropathologist, 1887–1964. See P.-Döring disease.

Pettit
Auguste, French physician, 1869–1939. See Bachman-P. test.

Peutz
J.L.A., Dutch physician. See P.-Jeghers syndrome, Jeghers-P. syndrome.

pexin (pek′sin)
SYN: chymosin.




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