coelostat
[ see-luh-stat ]
/ ˈsi ləˌstæt /
Save This Word!
noun Astronomy.
an apparatus consisting of a mirror driven by clockwork, used to enable a fixed telescope to keep the same area of sky in its field of view by compensating for the apparent rotation of the celestial sphere.
QUIZZES
QUIZ YOURSELF ON "WAS" VS. "WERE"!
Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
Question 1 of 7
“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.
Meet Grammar Coach
Improve Your Writing
Compare siderostat.
Origin of coelostat
Words nearby coelostat
coeliac, coeliac disease, coelom, coelomate, coeloscope, coelostat, coelurosaur, coemption, Coen, coenacle, coenesthesia
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for coelostat
It will be laid comfortably flat on the ground, and the rays of light reflected into it by a coelostat.
Astronomical Discovery|Herbert Hall Turner
British Dictionary definitions for coelostat
coelostat
/ (ˈsiːləˌstæt) /
noun
an astronomical instrument consisting of a plane mirror mounted parallel to the earth's axis and rotated about this axis once every two days so that light from a celestial body, esp the sun, is reflected onto a second mirror, which reflects the beam into a telescopeCompare siderostat
Word Origin for coelostat
C19 coelo-, from Latin caelum heaven, sky + -stat
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