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epithelium [epi'ai:liəm] abbr.
abbr., med.	epith (Andrey Truhachev)
med.	A protective tissue consisting of one or more layers of cells that line the internal surface of organs and glands and cover the outer surface of the body. In addition to enclosing and protecting body surfaces, certain types of epithelial cells produce mucus or use tiny hairs called cilia to help remove foreign substances.