Gregorian telescope

noun

a telescope similar in design to the Cassegrainian telescope but less widely used.

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Origin:
1755–65; named after James Gregory; see -ian

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World English Dictionary

Gregorian telescope

—n
	a form of reflecting astronomical telescope with a concave ellipsoidal secondary mirror and the eyepiece set behind the centre of the parabolic primary mirror

[C18: named after J. Gregory (died 1675), Scottish mathematician who invented it]

Collins English Dictionary - Complete & Unabridged 10th Edition
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