| PVC | peripheral venous catheterization; persistent vaginal cornification; polyvinyl chloride; postvoiding... |
|---|---|
| PR | by way of the rectum [Lat. per rectum]; far point [of accommodation] [Lat. punctum remotum]; palindr... |
| TAPVR | Total Anomalous Pulmonary Venous Return = TAPVC 4 Types of TAPVR &... |
| TAPVC | total anomalous pulmonary venous connection |
| TAPVD | total anomalous pulmonary venous drainage |
| anomalous diffusion | <radiobiology> Diffusion in most plasma devices, particularly tokamaks, is higher than what one would predict from understood causes. The observed, typical diffusion is referred to as anomalous because it has not yet been explained. Anomalous diffusion includes all diffusion which is not due to collisions and geometric effects. While such effects were not understood when the term was coined, and most still are not, diffusion due to well-understood wave phenomena is still 'anomalous'. Classical diffusion and Neo-classical diffusion are the two well-understood diffusion theories, although neither is adequate to fully explain the observed anomalous diffusion. See: entries for classical diffusion and neoclassical diffusion. Anomalous resistivity (09 Oct 1997) |
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| anomalous mitral arcade | Short chordae tendineae extending from both papillary muscles to the central portion of the anterior leaflet of the mitral valve and resulting in stenosis or incompetence of the valve. (05 Mar 2000) |
| anomalous trichromatism | A defect in colour perception in which there appears to be an abnormality or deficiency in one of the three primary pigments of the retinal cones. See: protanomaly, deuteranomaly, tritanomaly. (05 Mar 2000) |
| anomalous uterus | A malformed uterus caused by abnormal development or fusion of the paramesonephric ducts. (05 Mar 2000) |
| anomalous viscosity | The viscous behaviour of nonhomogenous fluids or suspensions, e.g., blood, in which the apparent viscosity increases as flow or shear rate decreases toward zero. (05 Mar 2000) |
| activated partial thromboplastin time | The time needed for plasma to form a fibrin clot following the addition of calcium and a phospholipid reagent; used to evaluate the intrinsic clotting system. (05 Mar 2000) |
| reaction of partial identity | See: gel diffusion precipitin tests in two dimensions. (05 Mar 2000) |
| partial | 1. Of, pertaining to, or affecting, a part only; not general or universal; not total or entire; as, a partial eclipse of the moon. "Partial dissolutions of the earth." 2. Inclined to favor one party in a cause, or one side of a question, more then the other; baised; not indifferent; as, a judge should not be partial. "Ye have been partial in the law." (Mal. Ii. 9) 3. Having a predelection for; inclined to favor unreasonably; foolishly fond. "A partial parent." "Not partial to an ostentatious display." (Sir W. Scott) 4. <botany> Pertaining to a subordinate portion; as, a compound umbel is made up of a several partial umbels; a leaflet is often supported by a partial petiole. Partial differentials, Partial differential coefficients, Partial differentiation, etc. (of a function of two or more variables), the differentials, differential coefficients, differentiation etc, of the function, upon the hypothesis that some of the variables are for the time constant. <mathematics> Partial fractions, the simple tones which in combination form an ordinary tone; the overtones, or harmonics, which, blending with a fundamental tone, cause its special quality of sound, or timbre, or tone colour. See, also, Tone. Origin: F, fr. LL. Partials, fr. L. Pars, gen. Partis, a part; cf. (for sense 1) F. Partiel. See Part. Source: Websters Dictionary (01 Mar 1998) |
| partial adrenocortical insufficiency | Normal basal adrenocortical function with failure of adrenocortical reserve to respond to ACTH stimulation. (05 Mar 2000) |
| partial agglutinin | Immune agglutinin present in an antiserum in lesser concentration than the major agglutinin. Synonym: partial agglutinin. (05 Mar 2000) |
| partial anencephaly | Congenital failure of the cerebrum to develop normally; usually the cerebellum and basal ganglia are represented at least in rudimentary form. Synonym: partial anencephaly. Origin: hemi-+ G. Kephale, head (05 Mar 2000) |
| partial aneuploidy | A type of mosaicism in which some cells have a normal number of chromosomes and some have an abnormal number. (05 Mar 2000) |
| partial anodontia | A condition of having fewer than the normal complement of teeth, either congenital or acquired. Synonym: oligodontia, partial anodontia. Origin: hypo-+ G. Odous, tooth (05 Mar 2000) |
| partial antigen | <immunology, molecular biology> Could be considered an isolated epitope: although a hapten (by definition) has an antibody directed against it, the hapten alone will not induce an immune response if injected into an animal, it must be conjugated to a carrier (usually a protein). The hapten constitutes a single antigenic determinant, perhaps the best known example is dinitro phenol (DNP) that can be conjugated to BSA and against which antiDNP antibodies are produced (antibodies to the BSA can be adsorbed out). Because the hapten is monovalent, immune complex formation will be blocked if the soluble hapten is present as well as the hapten carrier conjugate (assuming there is more than one hapten per carrier then an immune precipitate can be formed). Competitive inhibition by the soluble small molecule is sometimes referred to as haptenic inhibition and this term has carried over into lectin mediated haemagglutination where monosaccharides are added to try to block haemagglutination: the blocking sugar defines the specificity of the lectin. (18 Nov 1997) |
| partial breech extraction | Assisted breech delivery by the obstetrician with spontaneous delivery of the foetus to the level of the umbilicus. (05 Mar 2000) |