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1. any plant of the Australian genus Xanthorrhoea, having a woody stem, stiff grasslike leaves, and a spike of small white flowers: family Xanthorrhoeaceae. Some species produce fragrant resins
2. any of several similar Australasian plants
any one treelike monocotyledonous plant of the genus Xanthorrhoea. In a broader sense, a special life-form to which are assigned the genera Xanthorrhoea, Kingia, Dasypo-gon, and Pandanus. (The first three genera are in the family Xanthorrhoeaceae.)