un sidereal

sidereal

[sahy-deer-ee-uhl]
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

sidereally, adverb
nonsidereal, adjective
unsidereal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sidereal (saɪˈdɪərɪəl)
 
adj
1.  of, relating to, or involving the stars
2.  determined with reference to one or more stars: the sidereal day
 
[C17: from Latin sīdereus, from sīdus a star, a constellation]
 
si'dereally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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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 
  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
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