- an oak, Quercus nigra, of the southern U.S., growing chiefly along streams and swamps.
- any of several other American oaks of similar habit.
Origin of water oak
An Americanism dating back to 1680–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for water oak
But when he looked out he could see little more than the foliage of the water-oak.
Instantly the branches of the water-oak began to tremble, and July descended with all speed.
The elevated lands are mostly pine, interspersed with black-jack, post, and water-oak.Florida: Past and present
Samuel Curtis Upham