/ Dictionary / Index S shale oil: Meaning and Definition of Find definitions for: shale' oil" Pronunciation: [key] petroleum distilled from oil shale. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. shale shall Related Content Daily Word Quiz: designate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language