/ Dictionary / Index G glioma: Meaning and Definition of Find definitions for: gli•o•ma Pronunciation: (glī-ō'mu), [key] — pl. -mas, -ma•ta a tumor of the brain composed of neuroglia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: glioma (Thesaurus) glint gliosis Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language