| 单词 | gregorian telescope |
| 释义 | Gregorian telescopenouna telescope similar in design to the Cassegrainian telescope but less widely used. Origin of Gregorian telescope1755–65; named after James Gregory; see -ian Words nearby Gregorian telescopegrego, Gregorian, Gregorian calendar, Gregorian chant, Gregorian mode, Gregorian telescope, Gregorian tone, Gregorian water, Gregory, Gregory I, Gregory II Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for Gregorian telescopeGregorian telescope nouna 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 telescopeC18: 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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