wing nut
1. any tree of the genus Pterocarya; fruit is a small winged nutlet; Caucasus to southeastern Asia • Syn: wing-nut • Hypernyms: nut tree • Hyponyms: Caucasian walnut, Pterocarya fraxinifolia • Member Holonyms: Pterocarya, genus Pterocarya 2. a threaded nut with winglike projections for thumb and forefinger leverage in turning • Syn: wing-nut, wing screw, butterfly nut, thumbnut • Hypernyms: nut
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