endothelium

Etymology
From, as in.

Noun

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

Translations

 * Catalan: endoteli
 * Finnish:
 * Greek:
 * Italian:
 * Polish: śródbłonek
 * Spanish: endotelio
 * Turkish: endotel