(n.) 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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). epithelium. Retrieved September 24, 2026, from http://smartdefine.org/epithelium/definitions/2004295 |
| Chicago | Webster's. 2011. "epithelium" http://smartdefine.org/epithelium/definitions/2004295 (accessed September 24, 2026). |
| Harvard | Webster's 2011, epithelium, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/epithelium/definitions/2004295>. |
| MLA | Webster's. "epithelium" 27 May 2011. Web. 24 September 2026. <http://smartdefine.org/epithelium/definitions/2004295> |