an'gle of attack'
1. Also called, esp. Brit., angle of incidence. Aeron.the acute angle between the chord of an aircraft wing or other airfoil and the direction of the relative wind.
2. Railroads.the angular attitude of a wheel flange to the rail, esp. on curves.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.