资料来源 : pyDict

长短辐圆外旋轮线; 外旋轮线

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Epitrochoid \Ep`i*tro"choid\, n. [Pref. epi- + Gr. ? wheel +
   -oid.] (Geom.)
   A kind of curve. See {Epicycloid}, any {Trochoid}.