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Meaning of SIDEREAL

Pronunciation:  sI'deereeul

WordNet Dictionary
  1. [adj]  (of divisions of time) determined by daily motion of the stars; "sidereal time"
  2. [adj]  of or relating to the stars or constellations; "sidereal bodies"; "the sidereal system"

SIDEREAL is a 8 letter word that starts with S.


 Antonyms: civil



Webster's 1913 Dictionary
\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

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.