noun
: any of several chiefly tropical plants with fluids that may be used as an emergency source of drinking water: 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