endothelium

en·do·the·li·um   (ěn'dō-thē'lē-əm)    n.   pl. en·do·the·li·a (-lē-ə) A thin layer of flat epithelial cells that lines serous cavities, lymph vessels, and blood vessels. [New Latin endothēlium : endo- + Greek thēlē, nipple; see dhē(i)- in Indo-European roots.] en'do·the'li·al, en'do·the'li·oid' adj.

Main Entry: en·do·the·li·um
Pronunciation: "en-d&-'thE-lE-&m
Function: noun
Inflected Form: plural en·do·the·lia /-lE-&/
: an epithelium of mesoblastic origin composed of a single layer of thin flattened cells that lines internal body cavities(as the serous cavities or the interior of the heart)

endothelium en·do·the·li·um (ěn'dō-thē'lē-əm)
n. pl. en·do·the·li·a (-lē-ə)
A thin layer of flat epithelial cells that lines serous cavities, lymph vessels, and blood vessels.

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en'do·the'li·al adj.