/ Dictionary / Index M -mycin: Meaning and Definition of Find definitions for: -mycin Pronunciation: [key] a combining form used in the names of antibiotics, usually fungal derivatives: neomycin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mycetoma myco- Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language