meningioma

noun, plural me·nin·gi·o·mas, me·nin·gi·o·ma·ta [muh-nin-jee-oh-muh-tuh] /məˌnɪn dʒiˈoʊ mə tə/. Pathology.

1. a hard, encapsulated tumor that grows slowly along the meninges.

n. pl. me•nin•gi•o•mas

1. A slow-growing tumor of the meninges often creating pressure and damaging the brain and adjacent tissues, occurring most often in adults.