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Definition of asteroid : 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.

Synonyms:

angulate, planetoid, star-shaped, minor planet, angular

Usage examples:

• Rip realized suddenly that he and his men would have to live in bubbles and space suits while on the asteroid. - "Rip Foster in Ride the Gray Planet", Harold Leland Goodwin.
• I don't see how you can use this stuff to move an asteroid!" - "Rip Foster in Ride the Gray Planet", Harold Leland Goodwin.
• The incident of the passing of the asteroid was over. - "Astounding Stories of Super-Science, March 1930", Various.