/mak'euh day"mee euh/ , n.
1. any Australian tree of the genus Macadamia, esp. M. ternifolia, having whorled leaves and elongated clusters of pink flowers.
2. Also called macadamia nut . the edible, hard-shelled seed of this tree. Also called Queensland nut .
[ 1900-05; Macadam (d. 1865), Australian chemist; see -IA ]