/ Thesaurus / G Synonyms of glioblastoma Find synonyms for: Noun1. glioblastoma, spongioblastoma, brain tumor, brain tumourusage: a fast-growing malignant brain tumor composed of spongioblasts; nearly always fatalWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language