/ Dictionary / Index O oil pan: Meaning and Definition of Find definitions for: oil' pan" Pronunciation: [key] the bottom part of the crankcase of an internal-combustion engine in which the oil used to lubricate the engine accumulates. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. oil palm oilpaper Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language