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castle nut

noun

Etymology

The projections resemble the turrets of a castle.

Definitions

  1. A nut with rounded extensions projecting past the nut's opening. A cotter pin is inserted…

    A nut with rounded extensions projecting past the nut's opening. A cotter pin is inserted through a hole in the bolt and bent around the castle nut's projections to lock the nut in place.

The neighborhood

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sense glosses and etymology drawn from English Wiktionary · source · CC-BY-SA