Source : Webster's Revised Unabridged Dictionary (1913)

Anemometer \An`e*mom"e*ter\, n. [Gr. ? wind + -meter.]
   An instrument for measuring the force or velocity of the
   wind; a wind gauge.

Source : WordNet®

anemometer
     n : a gauge for recording the speed and direction of wind [syn:
         {wind gauge}, {wind gage}]