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Added 9 October 2026

endothelium

noun

noun Definition from Wiktionary (CC BY-SA). More about endothelium at Wordnik → Where our words come from →

A thin layer of flat epithelial cells that lines the heart, serous cavities, lymph vessels, and blood vessels.

Origin

From endo- + -thelium, as in epithelium.

From Wiktionary, via Kaikki.org (CC BY-SA)

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