hyperboloid

【计】 双曲面

形容词:hyperboloidal 

hy.per.bo.loid

n.Mathematics （名词）【数学】
Either of two quadric surfaces generated by rotating a hyperbola about either of its main axes and having a finite center with certain plane sections that are hyperbolas and others that are ellipses or circles.
双曲面：两个二次曲面的任何一个，通过使一个双曲线绕其任何一根中轴旋转而成，而且旋转时有一个有一定双曲线平面切面的中心，而其他切面是椭圆或圆周

【引伸】
hyper.boloid.al