Source : Webster's Revised Unabridged Dictionary (1913)

Coomb \Coomb\, n. [AS. cumb a liquid measure, perh. from LL.
   cumba boat, tomb of stone, fr. Gr. ? hollow of a vessel, cup,
   boat, but cf. G. kumpf bowl.]
   A dry measure of four bushels, or half a quarter. [Written
   also {comb}.]

Coomb \Coomb\, Coombe \Coombe\, n. [See {Comb}, {Combe}, in this
   sense.]
   A hollow in a hillside. [Prov. Eng.] See {Comb}, {Combe}.