endothelium noun. [ɛndǝ(ʊ)'Ɵi:lɪǝm] Pl. -ia [-ɪǝ]. L19.
[mod. Latin, from ENDO- + Greek thēlē nipple + -IUM.]
Anatomy. The layer of cells lining the blood-vessels, the heart, and the lymphatic vessels. Also, the layer of cells lining serous cavities (cf. MESOTHELIUM).

■ endothelial adjective L19.

■ endotheli'oma noun, pl. -mas, -mata [-mǝtǝ], a tumour developing from endothelial tissue L19.

■ endotheli'omatous adjective of or resembling an endothelioma E20.

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