endothelium

== English == === Etymology === From endo- +‎ -thelium, as in epithelium. === Pronunciation === Rhymes: -iːliəm === Noun === endothelium (plural endothelia) (anatomy) A thin layer of flat epithelial cells that lines the heart, serous cavities, lymph vessels, and blood vessels. ==== Derived terms ==== ==== Related terms ==== endothelioma epithelium thelium ==== Translations ====