Source : Webster's Revised Unabridged Dictionary (1913)

Culmen \Cul"men\ (k?l"m?n), n. [L., fr. cellere (in comp.) to
   impel; cf. celsus pushed upward, lofty.]
   1. Top; summit; acme. --R. North.

   2. (Zo["o]l.) The dorsal ridge of a bird's bill.