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hypotrochoid 长短辐圆内旋轮线; 次内摆线 长短辐圆内旋轮线; 次内摆线 Hypotrochoid \Hy`po*tro"choid\, n. [Pref. hypo- trochoid.]
(Geom.) A curve, traced by a point in the radius, or radius produced, of a circle which rolls upon the concave side of a fixed circle. See {Hypocycloid}, {Epicycloid}, and {Trochoid}. [1913 Webster]
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