noun🔗ShareNerium oleander, a notoriously poisonous shrub in the dogbane family, Apocynaceae, but nonetheless widely grown as an ornamental, having leathery lance-shaped leaves and deep rose-colored or white flowers."The bright pink flowers of the oleander in my neighbor's garden are beautiful, but I know I shouldn't touch them because they are poisonous. "plantnatureorganismbiologyenvironmentChat with AIVocabulary GamePractice Reading