mezereonPronunciation: /mɪˈzɪərɪən/Definition of mezereon noun a Eurasian shrub with fragrant purplish-red flowers and poisonous red berries, found chiefly in calcareous woodland. Daphne mezereum, family Thymelaeaceae Origin: late 15th century: from medieval Latin, from Arabic māzaryūnmezereon in other Oxford dictionaries Definition of mezereon in the US English dictionary