Pronunciation: (an'ti-bod"ē),[key] —n., —pl.-bod•ies. 1. any of numerous Y-shaped protein molecules produced by B cells as a primary immune defense, each molecule and its clones having a unique binding site that can combine with the complementary site of a foreign antigen, as on a virus or bacterium, thereby disabling the antigen and signaling other immune defenses. Abbr.: Ab
2. antibodies of a particular type collectively. Also called immunoglobulin.