‖ melaleucaBot.|mɛləˈl(j)uːkə| [mod.L. (Linnæus), f.Gr. µέλας black + λευκός white.] A genus of plants; a plant of this genus. 1822Med. Botany II. 129 Cajeput Tree, or Aromatic Melaleuca.1825Greenhouse Comp. I. 131 Proteas, acacias, melaleucas, and a few other Cape and Botany Bay plants.