A tree of the genus Carpinus (C. Americana), having a smooth gray bark and a ridged trunk, the wood being white and very hard. It is common along the banks of streams in the United States, and is also called ironwood. The English hornbeam is C. Betulus. The American is called also blue beech and water beech.
- Any of various trees of the genus Carpinus, having smooth grayish bark and hard whitish wood.
- The wood of one of these trees.