| Noun | 1. | genus Quercus - oakshamamelid dicot genus - genus of mostly woody relatively primitive dicotyledonous flowering plants with flowers often unisexual and often borne in catkins beech family, Fagaceae, family Fagaceae - chiefly monoecious trees and shrubs: beeches; chestnuts; oaks; genera Castanea; Castanopsis; Chrysolepis; Fagus; Lithocarpus; Nothofagus; Quercus oak tree, oak - a deciduous tree of the genus Quercus; has acorns and lobed leaves; "great oaks grow from little acorns" | |