English edit

 
The red curve is an epitrochoid.

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

Noun edit

epitrochoid (plural epitrochoids)

  1. 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

Derived terms edit

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See also edit