n.a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror
同义词：Cassegrainian telescope
英汉双解大词典
Gregorian telescope
1.
N（名词）
a form of reflecting astronomical telescope with a concave ellipsoidal secondary mirror and the eyepiece set behind the centre of the parabolic primary mirror 格雷戈里反射望远镜