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Definition of wing nut
1 (also wingnut) a nut with a pair of projections for the fingers to screw it on. 2an Asian tree of the walnut family, with a deeply fissured trunk, compound leaves, and characteristic broad-winged nutlets.
- Genus Pterocarya, family Juglandaceae
3 (wingnut) informal a mad or crazy person:some wingnut down in Finance a person with extreme, typically right-wing, views:McCarthyite wingnuts