antibody

an·ti·body

noun \ˈant-i-ˌbäd-ē\

plural an·ti·bod·ies

Definition of ANTIBODY

: any of a large number of proteins of high molecular weight that are produced normally by specialized B cells after stimulation by an antigen and act specifically against the antigen in an immune response, that are produced abnormally by some cancer cells, and that typically consist of four subunits including two heavy chains and two light chains—called also immunoglobulin

Illustration of ANTIBODY