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Definition of: epithelium
(ep′ə·thē′lē·əm) noun plural ·li·ums or ·li·a (-lē·ə) Biol.
A membranous tissue consisting of one or more layers of cells of various types and sizes, compactly joined and serving to line the canals, cavities, and ducts of the body as well as all free surfaces exposed to the air. [<NL <Gk. epi- upon + thēlē nipple]
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