- an oak, Quercus palustris, characterized by the pyramidal manner of growth of its branches and deeply pinnatifid leaves.
Origin of pin oak
An Americanism dating back to 1805–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for pin oak
Take the pin-oak, for instance, and note the softness of the greenery above its flowers.Getting Acquainted with the Trees
J. Horace McFarland