The American Heritage® Dictionary of the English Language, 4th Edition
n. Either of two deciduous trees (Carya glabra or C. ovalis) of the eastern United States, having pinnately compound leaves, male flowers grouped in catkins, and nuts with somewhat bitter kernels.
n. The edible tuber of Conopodium majus, native to western Europe.
n. Any of various types of hickory or their fruits; a hognut.
the GNU version of the Collaborative International Dictionary of English
n. See groundnut (d).
n. The bitter-flavored nut of a species of hickory (Carya glabra syn. Carya porcina); also, the tree itself.
The Century Dictionary and Cyclopedia
n. Same as hawknut.
n. The fruit of a North American tree, the brown hickory, Hicoria glabra (Carya porcina); also, the tree itself.
n. The fruit of Omphalea triandra and O. diandra, of the West Indies and South America.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. an American hickory tree having bitter nuts
Word Usage
"The meadows sway with flowers and sashaying grasses, and sooty black chimney sweeper moths rise up, flying low among pignut plants – their larval food plant."