pre·​cip·​i·​tin pri-ˈsi-pə-tən How to pronounce precipitin (audio)
: an antibody that forms a precipitate when it unites with its antigen

Word History


International Scientific Vocabulary, from precipitate

First Known Use

1900, in the meaning defined above

Time Traveler
The first known use of precipitin was in 1900

Dictionary Entries Near precipitin

Cite this Entry

“Precipitin.” Dictionary, Merriam-Webster, Accessed 25 Sep. 2023.

Medical Definition


pre·​cip·​i·​tin pri-ˈsip-ət-ən How to pronounce precipitin (audio)
: any of various antibodies which form insoluble precipitates with specific antigens and some of which are used in serological testing
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