/ Dictionary / Index O overthrust belt: Meaning and Definition of Find definitions for: o'verthrust belt" Pronunciation: [key] — Geol. (sometimes caps.)Geol. an elongate area in which thick rock layers have been pushed over one another by compressional forces within the earth's crust. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. overthrust overtime Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language