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castle nut

castle nut

noun

  1. a hexagonal nut with six slots in the head, two of which take a locking pin to hold it firmly in position
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of castle nut1

First recorded in 1900–05

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castle in the airCastle Peak

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