foehn also föhn 
(fœn, fān)
(fœn, fān)n.
A warm dry wind coming off the lee slopes of a mountain range, especially off the northern slopes of the Alps.
[German Föhn, from Middle High German fœnne, from Old High German phōno, from Vulgar Latin *faōnius, from Latin favōnius, the west wind, from favēre, to be favorable.]