/ Dictionary / Index O oleaginous: Meaning and Definition of Find definitions for: o•le•ag•i•nous Pronunciation: (ō"lē-aj'u-nus), [key] — adj. having the nature or qualities of oil. containing oil. producing oil. unctuous; fawning; smarmy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oleaginous (Thesaurus) oleaceous Olean Related Content Daily Word Quiz: reclusive Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language