| 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) |
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| 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) |