WordNet (r) 3.0 (2006):

east wind
    n 1: a wind from the east [syn: east wind, easter,
         easterly]

Easton's 1897 Bible Dictionary:

East wind
   the wind coming from the east (Job 27:21; Isa. 27:8, etc.).
   Blight caused by this wind, "thin ears" (Gen. 41:6); the
   withered "gourd" (Jonah 4: 8). It was the cause and also the
   emblem of evil (Ezek. 17:10; 19:12; Hos. 13:15). In Palestine
   this wind blows from a burning desert, and hence is destitute of
   moisture necessary for vegetation.