Lewis & Short

Edom, indecl. m.

  1. I. Esau, elder son of the patriarch Isaac: Esau, ipse est Edom, Vulg. Gen. 36, 1 al.; Isid. Orig. 7, 6, 33.
  2. II. A nation descended from Esau, Vulg. Num. 20, 14; id. 4 Reg. 3, 26 et saep.
  3. III. Transf., the country of the Edomites, Vulg. Num. 21, 4 et saep.