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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. Astronomy Any of numerous small celestial bodies that revolve around the sun, with orbits lying chiefly between Mars and Jupiter and characteristic diameters between a few and several hundred kilometers. Also called minor planet, planetoid.
  2. n. Zoology See starfish.
  3. adj. Star-shaped.

Century Dictionary and Cyclopedia

  1. Star-like.
  2. Having a flower like that of an aster.
  3. n. One of the small planets, 280 or more in number, between the orbits of Mars and Jupiter: more accurately called planetoids. See planetoid.
  4. n. One of the Asteroidea; a starfish, in a wide sense.

Wiktionary

  1. n. A naturally occurring solid object, smaller than a planet, orbiting a star.
  2. n. Any member of the taxonomic class Asteroidea; a starfish.

GNU Webster's 1913

  1. n. A starlike body; esp. one of the numerous small planets whose orbits lie between those of Mars and Jupiter; -- called also planetoids and minor planets.

WordNet 3.0

  1. adj. shaped like a star
  2. n. any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter)

Etymologies

  1. From Greek asteroeidēs, starlike : astēr, star; see ster-3 in Indo-European roots + -oeidēs, -oid.

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‘asteroid’ has been looked up 1387 times, loved by 1 person, added to 13 lists, and has a Scrabble score of 9.