different between endothelium vs epithelium

English

From endo- +? *thelium, as in epithelium.

endothelium (plural endothelia)

(anatomy) A thin layer of flat epithelial cells that lines the heart, serous cavities, lymph vessels, and blood vessels.

From New Latin epith?lium, from Ancient Greek ??? (epí, “on, atop, epi-”) + ???? (th?l?, “nipple”) + -ium (“aggregation”).

epithelium (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.
- 1969, Vladimir Nabokov, Ada or Ardor, Penguin 2011, p. 25:
  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.
Synonym: epithelial tissue

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