Definition - wing nut

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wing nut
  1. any tree of the genus Pterocarya; fruit is a small winged nutlet; Caucasus to southeastern Asia
  2. a threaded nut with winglike projections for thumb and forefinger leverage in turning
  3. a threaded nut with winglike projections for thumb and forefinger leverage in turning
  4. any tree of the genus Pterocarya; fruit is a small winged nutlet; Caucasus to southeastern Asia