dau;no;ru;bi;cin pronunciation: function: noun etymology: dauno- (as in daunomycin) + rubidomycin, a substance found to be identical with daunomycin (from international scientific vocabulary rubido- —fr. latin rubidus red— + -mycin)date: circa 1968 : an antibiotic c27h29no10 that is a nitrogenous glycoside and is used especially in the treatment of leukemia