/ Dictionary / Index O oil patch: Meaning and Definition of Find definitions for: oil' patch" Pronunciation: [key] — Slang. Slang. an area in which oil is produced. the petroleum industry. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. oilpaper oil-plant 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