/ Dictionary / Index O oil slick: Meaning and Definition of Find definitions for: oil' slick" Pronunciation: [key] a smooth area on the surface of water caused by the presence of oil. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. oilskin oil spill Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language