Definition of water tree
: any of several chiefly tropical plants with fluids that may be used as an emergency source of drinking water: such as a : a large Ceylonese pitcher plant (Nepenthes distillatoria) b : an African woody vein (Tetracera potatoria) that yields abundant watery sap when a large stem is cut c : any of several chiefly arborescent Australian plants (as of the family Proteaceae) that yield a watery sap when the bark or roots are cut; especially : a needle wood (Hakea leucoptera) that stores water in its thickened roots
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