Hypertext Webster Gateway: "epithelium"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Epithelium \Ep`i*the"li*um\, n.; pl. E. {Epitheliums}, L.
{Epithelia}. [NL., fr. Gr. 'epi` upon + ? nipple.] (Anat.)
The superficial layer of cells lining the alimentary canal
and all its appendages, all glands and their ducts, blood
vessels and lymphatics, serous cavities, etc. It often
includes the epidermis (i. e., keratin-producing epithelial
cells), and it is sometimes restricted to the alimentary
canal, the glands and their appendages, -- the term
endothelium being applied to the lining membrane of the blood
vessels, lymphatics, and serous cavities.
From WordNet (r) 1.7 (wn)
epithelium
n : membranous tissue covering internal organs and other
internal surfaces of the body [syn: {epithelial tissue}]
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