glio·blas·to·ma | \ˌglī-ō-ˌbla-ˈstō-mə \
variants: or less commonly glioblastoma multiforme \-ˌməlt-ə-ˈfȯrm-ē \
plural glioblastomas also glioblastomata\ˌglī-ō-ˌbla-ˈstō-mə-tə \ or glioblastomas multiforme or glioblastoma multiformes

Definition of glioblastoma 

: a malignant rapidly growing astrocytoma of the central nervous system and usually of a cerebral hemisphere

Examples of glioblastoma in a Sentence

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While comparing new case numbers in 2015 with those in 1995, the researchers found an additional 1,548 aggressive glioblastoma multiforme tumor cases annually. Jacqueline Howard, CNN, "Brain tumors on the rise in England, raising cell phone concerns," 2 May 2018 The trial, which involves 55 patients including one dad whose cancer has shown no signs of returning 18 months after diagnosis, is testing an immunotherapy vaccine that’s given in addition to traditional treatment methods for glioblastoma. Alexandria Hein, Fox News, "Dad battling brain cancer shows no sign of tumor regrowth after clinical trial," 18 June 2018 McCain, 81, was diagnosed with glioblastoma in July. Yvonne Wingett Sanchez, azcentral, "John McCain 'doesn't give a rat's ass' what Trump says or thinks of him, co-author says," 30 May 2018 The newlyweds walked into a local hospital and came out with a brain tumor diagnosis — which was later confirmed in the U.S. as cancer, glioblastoma. Sarah Schreiber, Good Housekeeping, "Heartbreaking Photo Documentary Captures True Love in the Face of Cancer," 22 Dec. 2016 Cappotelli was diagnosed with a grade 4 glioblastoma tumor, the most deadly form of brain cancer. Thomas Novelly, The Courier-Journal, "Swifties, statues and WWE: What you missed in Louisville this weekend," 2 July 2018 One year ago this weekend, the six-term senator and former prisoner of war was diagnosed with glioblastoma, a deadly form of brain cancer. Yvonne Wingett Sanchez, azcentral, "A year after John McCain's cancer diagnosis, Cindy McCain expresses gratitude to caregivers," 13 July 2018 At the moment, the prognosis for patients is not good: Adults being treated for aggressive glioblastoma generally live a little more than a year, the association reports. Lois K. Solomon,, "Boca Raton hospital tries novel treatment against brain cancer," 29 June 2018 The trial at the Duke Cancer Institute involved patients with glioblastoma, the kind of tumor that Senator John McCain, Republican of Arizona, is battling. Washington Post,, "Polio virus treatment increased survival in patients with deadly brain tumors, study shows," 26 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'glioblastoma.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of glioblastoma

circa 1923, in the meaning defined above

History and Etymology for glioblastoma

New Latin, from glia glia + blast- + -oma

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Last Updated

25 Sep 2018

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The first known use of glioblastoma was circa 1923

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More Definitions for glioblastoma


glio·blas·to·ma | \ˌglī-(ˌ)ō-bla-ˈstō-mə \
plural glioblastomas also glioblastomata\-mət-ə \

Medical Definition of glioblastoma 

: a malignant rapidly growing astrocytoma of the central nervous system and usually of a cerebral hemisphere Glioblastoma is the worst grade of malignant glioma, a relatively uncommon but deadly class of brain tumors that kills 97% of those diagnosed within 5 years.— Greg Miller, Science, 2 Jan. 2009

called also glioblastoma multiforme

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lying above or upon

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