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English definition of “endothelium”

endothelium

noun [C]     /ˌen.dəʊˈθiː.li.əm/ US  /ˌen.doʊˈθiː.li.əm/ (plural endothelia) specialized
the thin layer of cells that cover the inside walls of the blood vessels , heart and some other body parts )The circulatory system and blood
(Definition of endothelium noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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