EPITROCHOID

Noun

epitrochoid (plural epitrochoids)

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

Source: Wiktionary

Ep`i*tro"choid, n. Etym: [Pref. epi- + Gr. -oid.] (Geom.)

Definition: A kind of curve. See Epicycloid, any Trochoid.

Source: Webster’s Unabridged Dictionary 1913 Edition

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