Main Entry: pre·cip·i·tin Pronunciation: pri-'sip-&t-&n Function: noun : any of various antibodies which form insolubleprecipitates with specific antigens and some of which are used in serological testing
precipitin pre·cip·i·tin (prĭ-sĭp'ĭ-tĭn) n. An antibody that under suitable conditions combines with and causes a specific soluble antigen to precipitate.