/ Dictionary / Index M myco-: Meaning and Definition of Find definitions for: myco- Pronunciation: [key] a combining form meaning “mushroom, fungus,” used in the formation of compound words: mycology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. -mycin mycobacterium 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