Breadcrumb Home > Dictionary > Index O oil tanker: Meaning and Definition of Find definitions for: oil' tank"er Pronunciation: [key] a large ship specifically designed for transporting crude oil in bulk across the oceans. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. oilstone oiltight ✖ Related Content Daily Word Quiz: tautology Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language