WordNet (r) 3.0 (2006):
wing nut n 1: any tree of the genus Pterocarya; fruit is a small winged nutlet; Caucasus to southeastern Asia [syn: wing nut, wing-nut] 2: a threaded nut with winglike projections for thumb and forefinger leverage in turning [syn: wing nut, wing-nut, wing screw, butterfly nut, thumbnut]