noun
Etymology: pitch (IV)
: the surface of either of two tangent imaginary friction wheels having the same axes and the same angular velocities as those of a pair of real gears in mesh
noun
Etymology: pitch (IV)
: the surface of either of two tangent imaginary friction wheels having the same axes and the same angular velocities as those of a pair of real gears in mesh
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012