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Definition of: endothelium
(en′dō·thē′lē·əm) noun plural ·li·a (-lē·ə) Anat.
A membrane, composed of flat, thin cells, that lines blood vessels, lymphatic tubes, and cavities. [<NL <Gk. endo- within + thēlē nipple]
—en′do·the′li·al adjective
—en′do·the′li·oid, en·doth·e·loid (en·doth′loid) adjective
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