precipitin

[ pri-sip-i-tin ]

/ prɪˈsɪp ɪ tɪn /

an antibody that reacts with its specific antigen to form an insoluble precipitate.

Origin of precipitin

First recorded in 1895–1900; precipit(ate) + -in²

Graphs of precipitin reactions illustrating serological relationships.

Myology and Serology of the Avian Family Fringillidae |William B. Stallcup
The antiserum used for the precipitin reaction was obtained by treating a rabbit with human blood serum.

The Organism as a Whole |Jacques Loeb
The precipitin reaction is the most successful of the serological techniques thus far devised for systematic comparisons.

Myology and Serology of the Avian Family Fringillidae |William B. Stallcup
Some precipitin tests and preliminary remarks on the systematic relationships of four South American families of frogs.

The Genera of Phyllomedusine Frogs (Anura Hylidae) |William E. Duellman

Now all these specific reactions, the precipitin reaction as well as the anaphylactic reaction, can be called forth by proteins.

The Organism as a Whole |Jacques Loeb

precipitin

/ (prɪˈsɪpɪtɪn) /

immunol an antibody that causes precipitation when mixed with its specific antigen

precipitin

[ prĭ-sĭp′ĭ-tĭn ]

An antibody that under suitable conditions combines with and causes a specific soluble antigen to precipitate.