epicycloid

noun

epi·​cy·​cloid ˌe-pə-ˈsī-ˌklȯid 

: a curve traced by a point on a circle that rolls on the outside of a fixed circle

epicycloidal

ˌe-pə-sī-ˈklȯi-dᵊl 

adjective

Illustration of epicycloid

• epicycloid E traced by point P on circle R rolling on fixed circle F

Word History

First Known Use

circa 1696, in the meaning defined above

Rhymes for epicycloid

• albuminoid
• arytenoid
• cannabinoid
• carotenoid
• epidermoid
• epithelioid
• meteoroid
• paraboloid
• subarachnoid
• underemployed
• adenoid
• alkaloid