/ Dictionary / Index M muscid: Meaning and Definition of Find definitions for: mus•cid Pronunciation: (mus'id), [key] — adj. belonging or pertaining to the Muscidae, the family of dipterous insects that includes the common housefly. —n. any muscid fly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. musca volitans muscle Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language