'Endothelium' definitions:
Definition of 'endothelium'
(from WordNet)
noun
An epithelium of mesoblastic origin; a thin layer of flattened cells that lines the inside of some body cavities
Definition of 'Endothelium'
From: GCIDE
- Endothelium \En`do*the"li*um\, n.; pl. Endothelia. [NL., fr. Gr. 'e`ndon within + ? nipple.] (Anat.) The thin epithelium lining the blood vessels, lymphatics, and serous cavities. See Epithelium. [1913 Webster]