Epitrochoidal

/ˌɛpɪtrɒˈkɔɪdəl/ adjective

Definition

Relating to or having the shape or properties of an epitrochoid, describing curves that result from rolling circular motion.

Etymology

Formed from 'epitrochoid' plus the adjectival suffix '-al.' This mathematical adjective describes shapes and patterns created by epitrochoidal motion.

Kelly Says

Rotary engines in some cars (like Mazdas used to make) are based on epitrochoidal rotors—the spinning rotor traces an epitrochoidal path inside the engine housing, making them incredibly smooth.

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