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An antibody that reacts with a specific soluble antigen to produce a precipitate.


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


(prɪˈsɪp ɪ tɪn)

an antibody that reacts with an antigen to form a precipitate.
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Noun1.precipitin - an antibody that causes precipitation when it unites with its antigen
antibody - any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response
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Precipitating antibody titers showed a positive reaction to cockatiel droppings extract (DE) and also to pigeon sera.
We saw weak precipitating antibody reactions to other bird antigens besides cockatiel, even though there was not repeated exposure to the other birds.