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Gregorian telescope

noun
1.
a telescope similar in design to the Cassegrainian telescope but less widely used.
Origin
1755-1765
1755-65; named after James Gregory; see -ian
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Gregorian telescope

Gregorian telescope

noun
1.
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
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
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