Relating to or resembling an epicycloid, which is a curve traced by a point on a circle rolling around the outside of another circle.
From Greek 'epi' (upon) + 'kyklos' (circle) + Latin '-idalis' (relating to). The term emerged in 17th-century mathematics to describe geometric curves created by circular motion.
Epicycloids aren't just abstract math—they describe the actual paths traced by teeth on gears and even planets in historical astronomical models, making this a word that bridges pure geometry with mechanical engineering.
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