/ Dictionary / Index G Gregorian telescope: Meaning and Definition of Find definitions for: Grego'rian tel'escope Pronunciation: [key] a telescope similar in design to the Cassegrainian telescope but less widely used. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Gregorian mode Gregorian water Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language