Pronunciation: ep'i-the'le-um, -a
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, + thele, 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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Examples: glitazone, GI cocktail, etc.