/ Dictionary / Index M meteoroid: Meaning and Definition of Find definitions for: me•te•or•oid Pronunciation: (mē'tē-u-roid"), [key] — n. Astron. any of the small bodies, often remnants of comets, traveling through space: when such a body enters the earth's atmosphere it is heated to luminosity and becomes a meteor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: meteoroid (Thesaurus) meteorograph meteorol. Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language