Special cases include the limaçon with R = r and the epicycloid with d = r. The classic Spirograph toy traces out epitrochoid and hypotrochoid curves. The orbits of planets in the once popular geocentric Ptolemaic system are epitrochoids. The combustion chamber of the Wankel engine is an epitrochoid. ...
Found on
http://en.wikipedia.org/wiki/Epitrochoid
• (n.) A kind of curve. See Epicycloid, any Trochoid.
Found on
http://thinkexist.com/dictionary/meaning/epitrochoid/
A curve traced out by a point that is a distance c from the center of a circle of radius b, where c < b, that is rolling around the outside of another circle of radius a. It is described by the parametric equations x = (a + b) cos(t) - c cos[(a/b + 1)t], &...
Found on
http://www.daviddarling.info/encyclopedia/E/epitrochoid.html
Ep`i·tro'choid noun [ Prefix
epi- + Greek ... wheel +
-oid .]
(Geom.) A kind of curve. See
Epicycloid , any
Trochoid .
Found on
http://www.encyclo.co.uk/webster/E/58
a plane curve generated by the motion of a fixed point on the radius or extension of the radius of a circle that rolls externally, without slipping, on a fixed circle. The epitrochoid is a generalization of the epicycloid.
Found on
https://www.infoplease.com/dictionary/epitrochoid
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