割线的英文：
secant

参考例句：

A secant is defined as line passing through two points of the curve.
割线的定义是一条通过曲线上两点的直线。

secant是什么意思：
a. 割的,切的,交叉的
n. 割线,正切

The secant of the complement of a directed angle or arc.
余割有向角的余角或弧的余割

A secant is defined as line passing through two points of the curve.
割线的定义是一条通过曲线上两点的直线。