/ Dictionary / Index A asteroid belt: Meaning and Definition of Find definitions for: as'teroid belt" Pronunciation: [key] — Astron. Astron. the region of space between the orbits of Mars and Jupiter in which most asteroids are located. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. asteroid Asteroidea Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language