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epithelium (n.)[epithelium 词源字典]: 1748, Modern Latin (Frederick Ruysch), from Greek epi "upon" (see epi-) + thele "teat, nipple" (see fecund). Related: Epithelial.[epithelium etymology, epithelium origin, 英语词源]
endothelium: "The tissue which forms a single layer of cells lining various organs and cavities of the body, especially the blood vessels, heart, and lymphatic vessels. It is formed from the embryonic mesoderm", Late 19th century: modern Latin, from endo- 'within' + Greek thēlē 'nipple'.