/ Dictionary / Index M myoatrophy: Meaning and Definition of Find definitions for: my•o•at•ro•phy Pronunciation: (mī"ō-a'tru-fē), [key] — n. Pathol. atrophy of muscle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. myo- M.Y.O.B. Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language