castellated nut

noun

A type of nut (internally threaded fastener) with castellations, typically to hold a retaining pin that is passed through a cross-drilled hole, such as a cotter pin.

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Meanings

nouncastellated nut (plural castellated nuts)

plural castellated nuts

  1. A type of nut (internally threaded fastener) with castellations, typically to hold a retaining pin that is passed through a cross-drilled hole, such as a cotter pin.

Synonyms & antonyms

Also see
castle nut

Origin

Physically descriptive via a metaphor; called thus because the slots in the nut — the castellations — have a fancied resemblance to the battlements of a castle.

Full word history & related roots →
Cite this entry
APA

castellated nut. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/castellated%20nut

MLA

“castellated nut.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/castellated%20nut. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “castellated nut,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/castellated%20nut.

Source: castellated nut on Wiktionary, CC BY-SA 4.0.