asteroid

  1. Noun.  (astronomy) A naturally occurring solid object, which is smaller than a planet and is not a comet, that orbits a star.
  2. Noun.  (astronomy) In the Solar system, such a body that orbits within the orbit of Jupiter.
  3. Noun.  (zoology) Any member of the taxonomic class Asteroidea; a starfish.

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This entry was last updated on RefTopia from its source on 3/20/2012.