/ Thesaurus / C Synonyms of cd4 Find synonyms for: Noun1. cluster of differentiation 4, CD4, glycoproteinusage: a glycoprotein that is found primarily on the surface of helper T cells; "CD4 is a receptor for HIV in humans"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: garrulous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language