WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a fast-growing malignant brain tumor composed of spongioblasts; nearly always fatal
Word Usage
"But the most malignant kind -- and we do not know what type of brain tumor exactly this is, other than to say malignant glioma, but unfortunately the most common kind is something we call glioblastoma multiforme."