[en-doh-thee-lee-uh m] /ˌɛn doʊˈθi li əm/

noun, plural endothelia
[en-doh-thee-lee-uh] /ˌɛn doʊˈθi li ə/ (Show IPA)
a type of epithelium composed of a single layer of smooth, thin cells that lines the heart, blood vessels, lymphatics, and serous cavities.
noun (pl) -lia (-lɪə)
a tissue consisting of a single layer of cells that lines the blood and lymph vessels, heart, and some other cavities

endothelium en·do·the·li·um (ěn’dō-thē’lē-əm)
n. pl. en·do·the·li·a (-lē-ə)
A thin layer of flat epithelial cells that lines serous cavities, lymph vessels, and blood vessels.
en’do·the’li·al adj.
Plural endothelia
A thin layer of flat epithelial cells that lines the lymph vessels, blood vessels, and the inner cavities of the heart. Compare mesothelium.

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