| preictal | Occurring before a seizure or stroke. Origin: pre-+ L. Ictus, a stroke (05 Mar 2000) |
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| preimplantation diagnosis | Determination of the nature of a pathological condition or disease in the ovum, zygote, or blastocyst prior to implantation. Cytogenetic analysis is performed to determine the presence or absence of genetic disease. (12 Dec 1998) |
| preimplantation phase | The time period between fertilization and implantation. (12 Dec 1998) |
| preinduction | A modification in the third generation resulting from the action of environment on the germ cells of one or both individuals of the grandparental generation. An effect from the action of environment on the germ cells of progenitors upon their grandchildren. Origin: L. Prae, before, + inductio, a bringing in, fr. Induco, to lead in (05 Mar 2000) |
| preinfarction angina | An obsolete term for unstable angina. (05 Mar 2000) |
| preinfarction syndrome | <syndrome> Abrupt development of angina pectoris or worsening of existing angina by increases in its frequency or severity; sometimes heralds myocardial infarction. (05 Mar 2000) |
| preinterparietal bone | A large sutural bone occasionally found detached from the anterior portion of the os interparietale. Synonym: Goethe's bone. (05 Mar 2000) |
| Preisz | Hugo von, Hungarian bacteriologist, 1860-1940. See: Preisz-Nocard bacillus. (05 Mar 2000) |
| Preisz-Nocard bacillus | <bacteria> A species of gram-positive, asporogenous bacteria that was originally isolated from necrotic areas in the kidney of a sheep. It may cause ulcerative lymphangitis, abscesses, and other chronic purulent infections in sheep, horses, and other warm-blooded animals. Human disease may form from contact with infected animals. (12 Dec 1998) |
| prejudice | A preconceived judgment made without adequate evidence and not easily alterable by presentation of contrary evidence. (12 Dec 1998) |
| prekallikrein | <chemical> A plasma protein which is the precursor of kallikrein. Plasma that is deficient in prekallikrein has been found to be abnormal in thromboplastin formation, kinin generation, evolution of a permeability globulin, and plasmin formation. The absence of prekallikrein in plasma leads to fletcher factor deficiency, a congenital disease. Chemical name: Kallikreinogen (12 Dec 1998) |
| prelacrimal | Anterior to the lacrimal sac. (05 Mar 2000) |
| prelal | Of or pertaining to printing; typographical. Origin: L. Prelum a press. Source: Websters Dictionary (01 Mar 1998) |
| prelamin A endoprotease | <enzyme> Catalyses conversion of 74-kD lamin a precursor to 72-kD lamin a; dependent on farnesylation Registry number: EC 3.4.- (26 Jun 1999) |
| prelaminar part of optic nerve | <anatomy, nerve> The portion of the optic nerve anterior to the lamina cribrosa of the sclera. Synonym: pars prelaminaris nervi optici. (05 Mar 2000) |