/ Dictionary / Index S streptomycin: Meaning and Definition of Find definitions for: strep•to•my•cin Pronunciation: (strep"tu-mī'sin), [key] — n. Pharm. an antibiotic, CHNO, produced by a soil actinomycete, Streptomyces griseus, and used in medicine in the form of its white, water-soluble sulfate salt, chiefly in the treatment of tuberculosis. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: streptomycin (Thesaurus) streptomyces streptothricin Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language