antibody: Meaning and Definition of

an•ti•bod•y

1. any of numerous-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