1. any Australian tree of the genus Macadamia, especially M. ternifolia, having whorled leaves and elongated clusters of pink flowers.
  2. Also called macadamia nut. the edible, hard-shelled seed of this tree.


  1. any tree of the Australian proteaceous genus Macadamia, esp M. ternifolia, having clusters of small white flowers and edible nutlike seeds
  2. macadamia nut the seed of this tree

n.Australian evergreen tree, 1904, from Modern Latin (1858), named for Scotland-born chemist Dr. John Macadam (1827-1865), secretary of the Victoria Philosophical Institute, Australia.

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