Noun | 1. | hyaluronic acid - a viscous mucopolysaccharide found in the connective tissue space and the synovial fluid of movable joints and the humors of the eye; a cementing and protective substance vitreous body, vitreous humor, vitreous humour - the clear colorless transparent jelly that fills the posterior chamber of the eyeball synovia, synovial fluid - viscid lubricating fluid secreted by the membrane lining joints and tendon sheaths etc. mucopolysaccharide - complex polysaccharides containing an amino group; occur chiefly as components of connective tissue |