Century Dictionary and Cyclopedia
- n. In geometry, the curve traced by a point in the plane of a circle which rolls on the convex side of a fixed circle. The curve thus generated belongs to the family of roulettes, and becomes an epicycloid when the generating point is in the circumference of the rolling circle.
- n. A geometric curve traced by a fixed point on one circle which rotates around the perimeter of another circle. Examples include the shape of the Wankel engine
GNU Webster's 1913
“Mazda's new RX-8 sports car is unusual in its use of the rotary engine invented by Felix Wankel: a triangular rotor inside a combustion chamber that's a particular case of epitrochoid.”
“The _ellipse_, then, is described by these arrangements because it is a special form of the epitrochoid; and various other epitrochoids may be traced with Suardi's pen by substituting other wheels, with different numbers of teeth, for a in Fig. 43.”
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