The Collaborative International Dictionary of English v.0.48:
Glioma \Gli*o"ma\, n. [NL., fr. Gr. ? glue + -oma.] (Med.) A tumor springing from the neuroglia or connective tissue of the brain, spinal cord, or other portions of the nervous system. [1913 Webster]WordNet (r) 3.0 (2006):
glioma n 1: a tumor of the brain consisting of neuroglia