n.圆外旋轮线，外摆线

epicycloid gear → 摆线齿锥齿轮
curtate epicycloid → 短幅外摆线；长摆外摆线
prolate epicycloid → 长幅外摆线
spherical epicycloid → 球面外摆线
equidistant curve of epicycloid → 内摆线的等距曲线
equidistant curve of prolate epicycloid → 长幅外摆线的等距曲线
Epicycloid d → 外摆线
epicycloid bevel gear cutter → 摆线齿锥齿轮铣刀

【Noun】

1. a line generated by a point on a circle rolling around another circle