Breadcrumb Home > Dictionary > Index O oleander: Meaning and Definition of Find definitions for: o•le•an•der Pronunciation: (ō'lē-an"dur, ō"lē-an'-), [key] — n. a poisonous shrub, Nerium oleander, of the dogbane family, native to southern Eurasia, having evergreen leaves and showy clusters of pink, red, or white flowers, and widely cultivated as an ornamental. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oleander (Thesaurus) Olean oleaster ✖ Related Content Daily Word Quiz: quadrumanous Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language