Relating to the epithelium, the tissue that forms the outer layer of the body and lines internal surfaces.
From Greek 'epi' (upon) + 'thele' (nipple), literally meaning 'upon the nipple.' Coined in the 19th century by anatomists who noticed this tissue type was particularly prominent around nipples. The term was later extended to describe all surface and lining tissues in the body.
Despite its rather unusual etymological origin referring to nipples, epithelial tissue is everywhere in your body - it's your skin, the lining of your mouth, lungs, and digestive system. This tissue is remarkable because it's constantly replacing itself; your entire epithelial lining regenerates every few days to weeks.
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