Try Our Apps
Dictionary.com

follow Dictionary.com

2017 Word of the Year

Gregorian telescope

noun
1.
a telescope similar in design to the Cassegrainian telescope but less widely used.
Origin of Gregorian telescope
1755-1765
1755-65; named after James Gregory; see -ian
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
Cite This Source
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source

Word of the Day

Nearby words for gregorian telescope

Word Value for Gregorian

0
0
Scrabble Words With Friends