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adjective Astronomy.
1.
determined by or from the stars: sidereal time.
2.
of or pertaining to the stars.
Origin:
1625–35; < Latin sīdere(us) of, belonging to the stars (sīder-, stem of sīdus star, constellation + -eus adj. suffix) + -al1
1625–35; < Latin sīdere(us) of, belonging to the stars (sīder-, stem of sīdus star, constellation + -eus adj. suffix) + -al1
Related forms
si·de·re·al·ly, adverb
non·si·de·re·al, adjective
un·si·de·re·al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Sidereal
is always a great word to know.
So is phase. Does it mean:
| a celestial body with a mass of gas that is hot enough to produce and sustain nuclear fusion, thus producing luminosity |
| the particular appearance presented by the moon or a planet at a given time |
Collins
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Etymonline
Word Origin & History
sidereal
1634, "of or pertaining to the stars," earlier sideral (1594), from Fr. sidereal (16c.), from L. sidereus "starry, astral," from sidus (gen. sideris) "star, constellation," probably from PIE base *sweid- "to shine" (cf. Lith. svidus "shining, bright").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
sidereal  (sī-dîr'ē-əl) Pronunciation Key
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The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Word Dynamo Rating For Sidereal
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