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epithelium (n.)

1748, Modern Latin (Frederick Ruysch), from Greek epi "upon" (see epi-) + thēlē "teat, nipple" (from suffixed form of PIE root *dhe(i)- "to suck"). Related: Epithelial.

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Definitions of epithelium from WordNet

epithelium (n.)
membranous tissue covering internal organs and other internal surfaces of the body;
Synonyms: epithelial tissue
From wordnet.princeton.edu