- An antibody that under suitable conditions combines with and causes its specific and soluble antigen to precipitate from solution. SYN: precipitating antibody.
* * *pre·cip·i·tin pri-'sip-ət-ən n any of various antibodies which form insoluble precipitates with specific antigens and some of which are used in serological testing
* * *n.any antibody that combines with its antigen to form a complex that comes out of solution and is seen as a precipitate. The antibody-antigen reaction is specific; the precipitin reaction is therefore a useful means of confirming the identity of an unknown antigen or establishing that a serum contains antibodies to a known disease. This test may be performed in watery solution or in a semisolid medium such as agar gel.see also agglutination.
* * *pre·cip·i·tin (pre-sipґĭ-tin) an antibody to antigen that specifically aggregates the macromolecular antigen in vivo or in vitro to give a visible precipitate.
Medical dictionary. 2011.