antibody. Protein molecule produced in the blood by lymphocytes in response to the presence of foreign or invading substances ; such substances include the proteins carried on the ...

antibody, protein produced by the immune system (see immunity immunity, ability of an organism to resist disease by identifying and destroying foreign substances or organisms.

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antibody /an·ti·body/ (Ab) (an´ti-bod-e) an immunoglobulin molecule that reacts with a specific antigen that induced its synthesis and with similar molecules; classified ...

an·ti·bod·y   (n t-b d) n. pl. an·ti·bod·ies. A Y-shaped protein on the surface of B cells that is secreted into the blood or lymph in response to an antigenic stimulus ...