One of the mysteries of the English language finally explained.
Any of various trees or shrubs yielding drinkable sap, generally from the stems, as the African water vine, Tetracera alnifolia, or the roots, as the Australian tree Hakea leucoptera (also called needlebush).
Early 17th century (in an earlier sense). From water + tree.
water tree/ˈwɔːtə ˌtriː/
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