Quick definitions from WordNet (Beech family)
▸ noun: chiefly monoecious trees and shrubs: beeches; chestnuts; oaks; genera Castanea; Castanopsis; Chrysolepis; Fagus; Lithocarpus; Nothofagus; Quercus
▸ noun: chiefly monoecious trees and shrubs: beeches; chestnuts; oaks; genera Castanea; Castanopsis; Chrysolepis; Fagus; Lithocarpus; Nothofagus; Quercus