dedendum meaning in English

齿顶高
齿根齿跟高
齿根高度
牙底高

Measurement and instrument of addendum circle and dedendum circle diameter of odd tooth gears
奇数齿齿轮齿顶圆与齿根圆直径的测量及其量具
The entire dedendum should be round corner , to the gear of 200 pressure angle , the yield strength is largely improved than the 14 . 50 pressure angle gear
整个根都倒圆角压力角200的轮，其屈服强度比14 . 50压力角的轮得到极大