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plural epitheliums or epithelia
(anatomy) A membranous tissue composed of one or more layers of cells which forms the covering of most internal and external surfaces of the body and its organs: internally including the lining of vessels and other small cavities, and externally being the skin. quotations examples
the passenger's roving eyes paused for a moment as he listened inwardly to a nether itch, which he supposed to be (correctly, thank Log) only a minor irritation of the epithelium.
1969, Vladimir Nabokov, Ada or Ardor, Penguin, published 2011, page 25