Source : Webster's Revised Unabridged Dictionary (1913)

Orography \O*rog"ra*phy\, n. [Gr. 'o`ros, a mountain + -graphy.]
   That branch of science which treats of mountains and mountain
   systems; orology; as, the orography of Western Europe.

Source : WordNet®

orography
     n : the science of mountains [syn: {orology}]