trochoid: Meaning and Definition of

tro•choid

1. a curve traced by a point on a radius or an extension of the radius of a circle that rolls, without slipping, on a curve, another circle, or a straight line. Equation:= a&thgr; − b sin &thgr;, y = a − b cos &thgr;. x

1. rotating on an axis, as a wheel.