/ Dictionary / Index E erythromycin: Meaning and Definition of Find definitions for: e•ryth•ro•my•cin Pronunciation: (i-rith"ru-mī'sin), [key] — n. an antibiotic, CHNO, produced by an actinomycete, Streptomyces erythraeus, used chiefly in the treatment of diseases caused by many Gram-positive and some Gram-negative organisms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: erythromycin (Thesaurus) erythrocytometer erythrophobia Related Content Daily Word Quiz: divulge Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language