Windage

Wind´age

n.	1.	(Gun.) The difference between the diameter of the bore of a gun and that of the shot fired from it.
	2.	The sudden compression of the air caused by a projectile in passing close to another body.

Noun	1.	windage - the retarding force of air friction on a moving object
	2.	windage - bore-to-projectile difference in diameter
	3.	windage - exposure to the wind (as the exposed part of a vessel's hull which is responsible for wind resistance) Synonyms: wind exposure
	4.	windage - the deflection of a projectile resulting from the effects of wind Synonyms: wind deflection