/ Dictionary / Index O oil-plant: Meaning and Definition of Find definitions for: oil-plant Pronunciation: (oil'plant"), [key] — n. any of several plants, as the castor-oil plant or sesame, the seeds of which yield an oil. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. oil patch Oil Rivers Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language