castellation

noun

cas·​tel·​la·​tion

ˌkastəˈlāshən

plural -s

1

: the act of castellating

2

: a castellated structure

3

a

: battlement

b

: a groove or recess in a castellated structure (as a nut)

a cotter pin passing through the castellation and the hole in the bolt

Word History

Etymology

Medieval Latin castellation-, castellatio, from castellatus + -ion, -io -ion

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