CD8

noun

\ ˌsē-(ˌ)dē-ˈāt

Definition of CD8

: a glycoprotein that is found associated with a T cell receptor especially on the surface of a cytotoxic T cell and that binds to a major histocompatibility complex molecule on the surface of an antigen-presenting cell to facilitate antigen recognition and cytotoxic T cell activation —often used before another noun CD8 surface markersCD8 cells [=cells bearing CD8 on their surface]… the CD8 molecule is closely associated with MHC class I molecules on antigen-presenting cells. — Scientific American Medicine — compare CD4