plasmacyteListen to pronunciation(PLAZ-muh-site)A type of immune cell that makes large amounts of a specific antibody. Plasmacytes develop from B cells that have been activated. A plasmacyte is a type of white blood cell. Also called plasma cell.More InformationMultiple Myeloma/Other Plasma Cell NeoplasmsEnlarge this image in new windowBlood cell development. A blood stem cell goes through several steps to become a red blood cell, platelet, or white blood cell. Search NCI's Dictionary of Cancer TermsStarts withContainsBrowse:ABCDEFGHIJKLMNOPQRSTUVWXYZ#