castellated nut
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English
[edit]Etymology
[edit]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.
Noun
[edit]castellated nut (plural castellated nuts)
- 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.