/ Dictionary / Index A asphalt rock: Meaning and Definition of Find definitions for: as'phalt rock' Pronunciation: [key] — Geol. Geol. a rock formation, usually of limestone or sandstone, containing large amounts of bitumens. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. asphalt paper asphaltum Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language