| precipitation test | An in vitro test in which antigen is in soluble form and precipitates when it combines with added specific antibody in the presence of an electrolyte. See: gel diffusion precipitin tests, ring precipitin test. Synonym: precipitation test. (05 Mar 2000) |
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| precipitin | <protein> Any antibody that forms a precipitating complex (a precipitin line) with an appropriate multivalent antigen. The term is now outmoded. (18 Nov 1997) |
| precipitin reaction | See: precipitin, precipitin test. (05 Mar 2000) |
| precipitin test | An in vitro test in which antigen is in soluble form and precipitates when it combines with added specific antibody in the presence of an electrolyte. See: gel diffusion precipitin tests, ring precipitin test. Synonym: precipitation test. (05 Mar 2000) |
| precipitin tests | Serologic tests in which a positive reaction manifested by visible precipitation occurs when a soluble antigen reacts with its antibody. (12 Dec 1998) |
| precipitinogen | 1. An antigen that stimulates the formation of specific precipitin when injected into an animal body. 2. A precipitable soluble antigen. Synonym: precipitogen. Origin: precipitin + G. -gen, producing (05 Mar 2000) |
| precipitinogenoid | A precipitinogen that is altered by means of heating, thereby resulting in a substance that combines with the specific precipitin, but does not lead to the formation of a precipitate. (05 Mar 2000) |
| precipitins | Antibodies which elicit precipitation when combined with antigen. (12 Dec 1998) |
| precipitogen | 1. An antigen that stimulates the formation of specific precipitin when injected into an animal body. 2. A precipitable soluble antigen. Synonym: precipitogen. Origin: precipitin + G. -gen, producing (05 Mar 2000) |
| precipitoid | A heat-treated precipitin that when mixed with specific precipitinogen does not cause a precipitate and also interferes with the precipitating effect of additional nonheated precipitin. Origin: precipitin + G. Eidos, resemblance (05 Mar 2000) |
| precipitophore | In Ehrlich's side chain theory, the portion of a precipitin molecule that is required in the formation of a precipitate, as distinguished from the haptophore group. Origin: precipitin + G. Phoros, bearing (05 Mar 2000) |
| precise | 1. Having determinate limitations; exactly or sharply defined or stated; definite; exact; nice; not vague or equivocal; as, precise rules of morality. "The law in this point is not precise." (Bacon) "For the hour precise Exacts our parting hence." (Milton) 2. Strictly adhering or conforming to rule; very nice or exact; punctilious in conduct or ceremony; formal; ceremonious. "He was ever precise in promise-keeping." (Shak) Synonym: Accurate, exact, definite, correct, scrupulous, punctilious, particular, nice, formal. See Accurate. Precise"ly, Precise"ness. Origin: L. Praecisus cut off, brief, concise, p. P. Of praecidere to cut off in front, to cut off; prae = before + caedere to cut: cf. F. Precis. Cf. Concise. Source: Websters Dictionary (01 Mar 1998) |
| precision | 1. The quality of being sharply defined or stated; one measure of precision is the number of distinguishable alternatives to a measurement. 2. In statistics, the inverse of the variance of a measurement or estimate. 3. Reproducibility of a quantifiable result; an indication of the random error. (05 Mar 2000) |
| precision attachment | A frictional or mechanically retained unit used in fixed or removable prosthodontics, consisting of closely fitting male and female parts, an attachment that may be rigid in function or may incorporate a movable stress control unit to reduce the torque on the abutment. Synonym: frictional attachment, internal attachment, key attachment, keyway attachment, parallel attachment, slotted attachment. (05 Mar 2000) |
| precision rest | A rest consisting of closely interlocking parts. (05 Mar 2000) |