Definition of cork tree
1 : cork oak
2 Australia : a prickly Australian coral tree (Erythrina vespertilis) with soft spongy wood
3 : any of a genus (Phellodendron) of aromatic deciduous trees of eastern Asia that have compound leaves and greenish flowers, are often grown for ornament or shade, and include some (such as the Amur cork tree) with a corky bark — see chinese cork tree
4 West Indies : portia tree
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