Definition of horseradish tree
1 : an East Indian tree (Moringa oleifera) that has a horseradish-flavored root and is cultivated throughout the tropics for its elongated capsular fruit which when young is pickled or cooked as a vegetable and for its seeds which yield ben oil
2 : any Australian tree of the genus Codonocarpus (family Phytolaccaceae) having pungent leaves suggesting the flavor of horseradish or mustard
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