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
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Merriam-Webster unabridged
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Time Traveler for CD8
The first known use of CD8 was in 1984
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