Webster's English Dictionary

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windage

wind.age \'win-dij\ n 1a: the space between the projectile of a smoothbore 
   gun and the surface of  the bore 1b: the difference between the diameter of 
   the bore of a muzzle-loading rif le cannon and that of the projectile 
   cylinder 2a: the amount of sight deflection necessary to compensate for 
   wind displac ement in aiming a gun 2b1: the influence of the wind in 
   deflecting the course of a projectile  2b2: the amount of deflection due to 
   the wind  3: the disturbance of the air caused by a passing object (as a 
   projectile)  4: the surface exposed (as by a ship) to the wind