- a tall hickory tree, Carya illinoinensis, of the southern U.S. and Mexico, cultivated for its oval, smooth-shelled, edible nuts: the state tree of Texas.
- a nut of this tree.
- a hickory tree, Carya pecan (or C. illinoensis), of the southern US, having deeply furrowed bark and edible nuts
- the smooth oval nut of this tree, which has a sweet oily kernel
