(n) monoecious trees and shrubs (including the genera Betula and Alnus and Carpinus and Corylus and Ostrya and Ostryopsis), Syn. birch family, family Betulaceae
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
n. 1. a natural family of monoecious trees and shrubs, including the genera Betula; Alnus; Carpinus; Corylus; Ostrya; and Ostryopsis. Syn. -- family Betulaceae, birch family. [ WordNet 1.5 ]