endothelium
noun
en·do·the·li·um
ˌen-də-ˈthē-lē-əm
-dō-
plural endothelia
ˌen-də-ˈthē-lē-ə
-dō-
1
: an epithelium of mesodermal origin composed of a single layer of thin flattened cells that lines internal body cavities and the lumens of vessels
2
: the inner layer of the seed coat of some plants
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Merriam-Webster unabridged
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