red oak

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Either of two eastern North American deciduous trees (Quercus rubra or Q. falcata) having lobed leaves with sharp tips and acorns with a shallow, saucer-shaped cup.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of numerous American oaks having 4 stamens in each floret, acorns requiring two years to mature and leaf veins usually extending beyond the leaf margin to form points or bristles