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Sidereal

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si⋅de⋅re⋅al

  [sahy-deer-ee-uhl]
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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; < L sīdere(us) of, belonging to the stars (sīder-, s. of sīdus star, constellation + -eus adj. suffix) + -al 1

Related forms:
si⋅de⋅re⋅al⋅ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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si·de·re·al   (sī-dîr'ē-əl)   
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.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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, © 2001 Douglas Harper
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