Medical Term:

epithelium

Pronunciation: ep′i-thē′lē-ŭm, -ă

Definition: The purely cellular avascular layer covering all free surfaces, cutaneous, mucous, and serous, including the glands and other structures derived therefrom.

[G. epi, upon, + thēlē, nipple, a term applied originally to the thin skin covering the nipples and the papillary layer of the border of the lips]

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