Gregorian telescope
noun
a telescope similar in design to the Cassegrainian telescope but less widely used.
British Dictionary definitions for gregorian telescope
Gregorian telescope
noun
a form of reflecting astronomical telescope with a concave ellipsoidal secondary mirror and the eyepiece set behind the centre of the parabolic primary mirror
Word Origin for Gregorian telescope
C18: named after J.
Gregory (died 1675), Scottish mathematician who invented it