Meaning of canyon wind

can'yon wind"

Pronunciation: (wind), [key]
  1. a nocturnal, down-canyon flow of air caused by the cooling of the canyon walls. Cf. valley wind.
  2. a wind modified in direction and speed by being forced to blow through a canyon or gorge.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.