高中解析几何教材中给出了圆锥曲线的两种定义,但这两种定义却均与“圆锥”无关,不足以揭示圆锥曲线之所以被称为“圆锥曲线”的原因.其实,在解析法诞生以前,很早就有了关于圆锥曲线的研究,就产生了“圆锥曲线”一词.圆锥曲线来源于平面截圆锥面,这 Two definitions of conic curves are given in high school analytical geometry textbooks, but these two definitions are all independent of “cones,” which is not sufficient to reveal why conical curves are called “conical curves”. Before the birth of the analytical method, there was a long time ago about the study of conic curves, which produced the word “conical curve”. The conic curve originated from the plane-cut conical surface.