epicycloid

== English == === Etymology === From epi- (“above or outside”) +‎ cycloid. === Pronunciation === === Noun === epicycloid (plural epicycloids) (geometry) The locus of a point on the circumference of a circle that rolls without slipping on the circumference of another circle. Synonym: hypocycloid ==== Derived terms ==== ==== Translations ==== === See also === cycloid epicycle roulette Spirograph