/ Dictionary / Index M myxoma: Meaning and Definition of Find definitions for: myx•o•ma Pronunciation: (mik-sō'mu), [key] — pl. -mas, -ma•ta a soft tumor composed of connective and mucoid tissue. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: myxoma (Thesaurus) myxoid myxomatosis Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language