[mass noun]the tissue which forms a single layer of cells lining various organs and cavities of the body, especially the blood vessels, heart, and lymphatic vessels. It is formed from the embryonic mesoderm 内皮。 比较 epithelium
派生 endothelial adjective 语源
late 19th cent.: modern Latin, from endo- 'within' + Greek thēlē 'nipple'