windage

(windij)

noun

  1. the disturbance of air around a moving projectile
    1. the deflection of a projectile by the effects of the wind
    2. the degree of this
    3. in aiming a gun, the degree of adjustment of the wind gauge to compensate for such deflection
  2. the space between the inside wall of the barrel of a firearm and its projectile, to allow for the expansion of gas in firing, as measured by the difference in diameters of the bore and projectile
  3. the part of a ship's surface exposed to the wind

See windage in American Heritage Dictionary 4

noun
  1. a. The effect of wind on the course of a projectile.
    b. The point or degree at which the wind gauge or sight of a rifle or gun must be set to compensate for the effect of the wind.
    c. The difference in a given firearm between the diameter of the projectile fired and the diameter of the bore of the firearm.
  2. The disturbance of air caused by the passage of a fast-moving object, such as a railway train.
  3. Nautical The part of the surface of a ship exposed to the wind.

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