Etymology
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asteroid (n.)

"one of the planetoids orbiting the sun, found mostly between Mars and Jupiter," 1802, coined probably by German-born English astronomer William Herschel (1738-1822) from Greek asteroeides "star-like," from aster "star" (from PIE root *ster- (2) "star") + -eidos "form, shape" (see -oid). Related: Asteroidal.

updated on April 24, 2017

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Definitions of asteroid from WordNet
1
asteroid (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);
2
asteroid (adj.)
shaped like a star;
Synonyms: star-shaped
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.