1. Decoration of an opening with cusps and foils, as in Gothic tracery. 
   叶状饰开口处装饰以尖叶或叶箔，象哥特建式筑中的花饰窗格子
2. an arch having cusps in the intrados on either side of the apex. 
   在顶点两侧的内弧面上仍然有尖端的拱。
3. To close so that the cusps fit together. Used of the teeth of the upper and lower jaws. 
   上下齿咬合关闭以使各点能咬合。用于上下腭的牙齿
4. A circle whose circumference rolls along the circumference of a fixed circle, thereby generating an epicycloid or a hypocycloid. 
   周转圆一个围绕着另一个固定圆周长滚动的圆，从而产生圆外旋轮线或圆内旋轮线，即外摆线或内摆线
5. a decoration using cusps. 
   一个装饰品使用尖端。

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