castle nut
noun
Origin of castle nut
1First recorded in 1900–05
Words Nearby castle nut
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
British Dictionary definitions for castle nut
castle nut
noun
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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