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Gregorian telescope

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noun
a telescope similar in design to the Cassegrainian telescope but less widely used.
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Origin of Gregorian telescope

1755–65; named after James Gregory; see -ian
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use Gregorian telescope in a sentence

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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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