• synonyms


  1. 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.
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Origin of epitrochoid

First recorded in 1835–45; epi- + trochoid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for epitrochoid

Historical Examples

  • The curve may be regarded as an epitrochoid (see Epicycloid) in which the rolling and fixed circles have equal radii.

    Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 6