/ Dictionary / Index O oilseed: Meaning and Definition of Find definitions for: oil•seed Pronunciation: (oil'sēd"), [key] — n. any of several seeds, as the castor bean, sesame, or cottonseed, from which an oil is expressed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oilseed (Thesaurus) oil sand oil shale Related Content Daily Word Quiz: heifer Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language