A hard coarse-grained oak, Quercus aquatica or nigra, of the southern U.S. Also, the pin-oak, Q. palustris. Also applied to certain Australian trees of the genera Casuarina and Callistemon.

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1717.  Petiveriana, III. 207. Water Oak. Is an Evergreen, growing in Swamps, Fresh-water Ponds, and by River Sides.

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1796.  H. Hunter, trans. St.-Pierre’s Stud. Nat. (1799), II. 165. The water-oak, and the willow-leafed oak, rise to no great height.

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1819.  D. B. Warden, Acc. United States, I. 174. Water oak, Quercus aquatica.

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1887.  G. W. Cable, Grande Pointe, ii., in Century Mag., March, 662/1. Sweet-gums, water-oaks, magnolias.

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1890.  ‘R. Boldrewood,’ Miner’s Right, xvii. 166. Strange shadows gliding … amid the dark-leaved water-oaks.

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