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antibody (n.)

"substance developed in blood as an antitoxin," 1901, a hybrid formed from anti- "against" + body. Probably a translation of German Antikörper, condensed from a phrase such as anti-toxischer Körper "anti-toxic body" (1891).

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Definitions of antibody

antibody (n.)
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;
From wordnet.princeton.edu