/ Dictionary / Index M meningioma: Meaning and Definition of Find definitions for: me•nin•gi•o•ma Pronunciation: (mu-nin"jē-ō'mu), [key] — pl. -mas, -ma•ta a hard, encapsulated tumor that grows slowly along the meninges. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: meningioma (Thesaurus) meninges meningitis Related Content Daily Word Quiz: quandary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language