ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: horn (I) + beam; from its hard, smooth, close-grained wood — more at beam
1. : a tree of the genus Carpinus: as
a. : an Old World tree ( C. betulus ) with smooth gray bark, hardy white wood, and leaves resembling those of the beech
b. : a similar tree ( C. caroliniana ) of America
2. : hop hornbeam
3. : planer tree