/ Dictionary / Index O ombu: Meaning and Definition of Find definitions for: om•bu Pronunciation: (om-b'), [key] — n. a South American tree, Phytolacca dioica, having a thick trunk and large, evergreen leaves. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ombu (Thesaurus) ombrellino ombudsman Related Content Daily Word Quiz: diaphanous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language