Cassegrain telescope

[ kas-uh-greyn ]

/ ˈkæs əˌgreɪn /

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noun Astronomy.

a reflecting telescope in which the light, passing through a central opening in the primary mirror, is brought into focus a short distance behind it by a secondary mirror.

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Also called Cas·se·grain·i·an tel·escope

[kas-uh-grey-nee-uhn]. /ˌkæs əˈgreɪ ni ən/.

Origin of Cassegrain telescope

1805–15; named after N. Cassegrain, 17th-century French scientist, its inventor

Words nearby Cassegrain telescope

cassata, cassation, Cassatt, Cassatt, Mary, cassava, Cassegrain telescope, Cassel, Casselberry, Cassel brown, Cassel yellow, cassena

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use Cassegrain telescope in a sentence

Williams did it with me several times, for instance when I mentioned the Hubble Space Telescope.
The Stacks: Robin Williams, More Than A Shtick Figure|Joe Morgenstern|August 16, 2014|DAILY BEAST
The instrument is attached to the Anglo-Australian Telescope at the Siding Spring Observatory, northwest of Sydney, Australia.
SAMI Is Like Google Earth for the Universe|Matthew R. Francis|July 27, 2014|DAILY BEAST
The Swift telescope is designed to detect any amount of extra high-energy light, then turn to locate the source.
The Gamma-Ray Burst That Wasn’t|Matthew R. Francis|June 1, 2014|DAILY BEAST
If you live in a place with a dark night sky, you might be able to see M31 without a telescope.
The Gamma-Ray Burst That Wasn’t|Matthew R. Francis|June 1, 2014|DAILY BEAST

But the results coming out of BOSS are beautiful, even if the telescope is hideous.
Using Black Holes to Measure Dark Energy, Like a BOSS|Matthew R. Francis|April 13, 2014|DAILY BEAST
Another crash, which nearly shut up his spine like a telescope, told him that there were no wings.
The Giant of the North|R.M. Ballantyne
To spy out the land with a naval telescope over a mile of sea means taking a lot on trust as we learned to our cost on April 25th.
Gallipoli Diary, Volume I|Ian Hamilton
These instruments were of a simple nature, for the magnifying glass was not yet contrived, and so the telescope was impossible.
Outlines of the Earth's History|Nathaniel Southgate Shaler
With the telescope somewhere near a hundred million are brought within the limits of vision.
Outlines of the Earth's History|Nathaniel Southgate Shaler
He put his canvas telescope down, and placed a heavy foot on it for safety.
Scattergood Baines|Clarence Budington Kelland

British Dictionary definitions for Cassegrain telescope

Cassegrain telescope

/ (ˈkæsɪˌɡreɪn) /

noun

an astronomical reflecting telescope in which incident light is reflected from a large concave paraboloid mirror onto a smaller convex hyperboloid mirror and then back through a hole in the concave mirror to form the image

Word Origin for Cassegrain telescope

C19: named after N. Cassegrain, 17th-century French scientist 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