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castle nut

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noun
  1. castellated nut.
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Origin of castle nut

First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for 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
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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