water oak
/ˈwɔːtə ˌəʊk/noun
Chiefly North American. Any of various oaks of riverside or swampy habitats, as the pin oak (Quercus palustris) and the laurel oak (Q. laurifolia); specifically an oak of the south-eastern United States, Q. nigra, with hard, coarse-grained wood. Also ( Australian ): a river she-oak (genus Casuarina) ( rare ).
Origin
Early 18th century; earliest use found in John Lawson (d. 1711), surveyor. From water + oak.