butterfly nut

/ˌbʌdərˈflaɪ nət/
/ˈbʌtəflaɪ nət ɛnjuˈti/
IPA guide

Definitions of butterfly nut
  1. noun
    a threaded nut with winglike projections for thumb and forefinger leverage in turning
    synonyms: thumbnut, wing nut, wing screw, wing-nut
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    type of:
    nut
    a small (usually square or hexagonal) metal block with internal screw thread to be fitted onto a bolt
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