/ Dictionary / Index O oleum: Meaning and Definition of Find definitions for: o•le•um Pronunciation: (ō'lē-um), [key] — pl. o•le•a o•le•ums oil. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. olethreutid O level Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language