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Definition of Thumbnut
1. Noun. A threaded nut with winglike projections for thumb and forefinger leverage in turning. 
Definition of Thumbnut
1. a nut that is turned by the thumb and fingers [n -S]
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1. Noun. A threaded nut with winglike projections for thumb and forefinger leverage in turning. 
1. a nut that is turned by the thumb and fingers [n -S]