chinquapin /ˈt͡ʃɪnkəpɪn/noun 9forms 1 noun9 •Any of certain species of tree in the chestnut genus Castanea. •Allegheny chinkapin (Castanea pumila) •Ozark chinkapin (Castanea ozarkensis) •Chinese chinkapin (Castanea henryi) •Any in the genus Castanopsis of trees. •Any in the genus Chrysolepis of trees and shrubs. •A water chinquapin, an aquatic plant of species Nelumbo lutea, American lotus. •Quercus muehlenbergii, a tree whose leaves resemble those of chestnut-genus chinquapins. •A redear sunfish, a freshwater fish of the southeastern US (Lepomis microlophus). formschinquapins