Source : Webster's Revised Unabridged Dictionary (1913)

Comb \Comb\, Combe \Combe\ (? or ?), n. [AS. comb, prob. of
   Celtic origin; cf. W. cwm a dale, valley.]
   That unwatered portion of a valley which forms its
   continuation beyond and above the most elevated spring that
   issues into it. [Written also {coombe}.] --Buckland.

         A gradual rise the shelving combe Displayed. --Southey.

Combe \Combe\ (? or ?), n.
   See {Comb}.