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sidereal
6 dictionary results for: Sidereal
Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
si·de·re·al       [sahy-deer-ee-uhl] Pronunciation Key
–adjective Astronomy.
1.determined by or from the stars: sidereal time.
2.of or pertaining to the stars.
[Origin: 1625–35; < L sīdere(us) of, belonging to the stars (sīder-, s. of sīdus star, constellation + -eus adj. suffix) + -al1]

—Related forms
si·de·re·al·ly, adverb
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
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American Heritage Dictionary - Cite This Source - Share This
si·de·re·al       (sī-dîr'ē-əl)  Pronunciation Key 
adj.  
  1. Of, relating to, or concerned with the stars or constellations; stellar.
  2. Measured or determined by means of the apparent daily motion of the stars: sidereal time.


[From Latin sīdereus, from sīdus, sīder-, constellation, star.]

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Online Etymology Dictionary - Cite This Source - Share This
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, © 2001 Douglas Harper
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WordNet - Cite This Source - Share This
sidereal

adjective
1. of or relating to the stars or constellations; "sidereal bodies"; "the sidereal system" 
2. (of divisions of time) determined by daily motion of the stars; "sidereal time" [ant: civil] 

WordNet® 3.0, © 2006 by Princeton University.
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The American Heritage Science Dictionary - Cite This Source - Share This
sidereal       (sī-dîr'ē-əl)  Pronunciation Key 
  1. Relating to the stars or constellations.
  2. Measured with respect to the background of fixed stars instead of the Sun.

The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Sidereal

Si*de"re*al\, a. [L. sidereus, from sidus, sideris, a constellation, a star. Cf. Sideral, Consider, Desire.]

1. Relating to the stars; starry; astral; as, sidereal astronomy.

2. (Astron.) Measuring by the apparent motion of the stars; designated, marked out, or accompanied, by a return to the same position in respect to the stars; as, the sidereal revolution of a planet; a sidereal day.

Sidereal clock, day, month, year. See under Clock, Day, etc.

Sideral time, time as reckoned by sideral days, or, taking the sidereal day as the unit, the time elapsed since a transit of the vernal equinox, reckoned in parts of a sidereal day. This is, strictly, apparent sidereal time, mean sidereal time being reckoned from the transit, not of the true, but of the mean, equinoctial point.

Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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