Source : Webster's Revised Unabridged Dictionary (1913)

Himalayan \Hi*ma"la*yan\, a. [Skr. him[=a]laya, prop., the abode
   of snow.]
   Of or pertaining to the Himalayas, the great mountain chain
   in Hindostan.

Source : WordNet®

Himalayan
     adj : of or relating to the Himalayas; "Himalayan peaks"