单词	epicycloid
释义	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
随便看	probangs probasidium probata probate probate bond probate court probate duty probate homestead probated probates probating probation probation officer probational probationally probationaries probationary probationer probationers probationership probations probationship probative probator probatory

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