/ epəθiːliːəm /
Množina reči epithelium je epithelia.
ETYM New Lat., from Greek epi upon + thele nipple.
Membranous tissue covering internal organs and other internal surfaces of the body.
In animals, tissue of closely packed cells that forms a surface or lines a cavity or tube. Epithelium may be protective (as in the skin) or secretory (as in the cells lining the wall of the gut).
Cellular membrane covering surface or lining cavity or passage.