endothelioma

noun, plural en·do·the·li·o·mas, en·do·the·li·o·ma·ta [en-doh-thee-lee-oh-muh-tuh] /ˌɛn doʊˌθi liˈoʊ mə tə/. Pathology.

1. a tumor originating from the endothelium.

noun plural -mata (-mətə)

1. pathol a tumour originating in endothelial tissue, such as the lining of blood vessels

n. pl. en•do•the•li•o•mas

1. Any of various benign or occasionally malignant neoplasms derived from the endothelial tissue of blood vessels or lymphatic channels.