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Vinony

epicycloid

noun

  1. family of plane curves in mathematics
L320190 on Wikidata ↗

Wiktionary

noun

Etymology: Etymology tree Proto-Indo-European *h₁ep-der. Proto-Indo-European *h₁épsder. Proto-Indo-European *h₁epi Proto-Hellenic *epí Ancient Greek ἐπί (epí) Ancient Greek ἐπῐ- (epĭ-)der. English epi- English cycloid English epicycloid From epi- (“above or outside”) + cycloid.

  1. The locus of a point on the circumference of a circle that rolls without slipping on the circumference of another circle.