/ Dictionary / Index M myo-: Meaning and Definition of Find definitions for: myo- Pronunciation: [key] a combining form meaning “muscle,” used in the formation of compound words: myology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Mynheer myoatrophy Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language