/ Dictionary / Index D dactinomycin: Meaning and Definition of Find definitions for: dac•ti•no•my•cin Pronunciation: (dak"tu-nō-mī'sin), [key] — n. Pharm. a cytotoxic polypeptide, CHNO, isolated from the bacterium Streptomyces parvullus, used in the treatment of certain cancers. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dacryorrhea dactyl Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language