a. [f. prec. + -AL.] Of the form or nature of an epicycloid.
1812. Woodhouse, Astron., xvi. 172. The true pole … will describe an epicycloidal curve.
1837. Whewell, Hist. Induct. Sc., III. iv. § 3 I. 205. The epicycloidal form of her orbit.
1884. F. J. Britten, Watch & Clockm., 292. The pinion … must have the epicycloidal addendum to secure proper action.
