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 History of this Word

"castle" is from "castellum" (fortress), spoken by ancient people in central Italy around 700 B.C.

"slot" is from "esclot" (horse's hoofprint), spoken in France
which is from "slodh" (track), spoken by people in North England about 800 A.D.

"nut" is from "hnutu", spoken by people in England during 450-1100 A.D.

Words related to this meaning

grammar is noun

"castle nut" is a type of nut

Definition

castle nut illustration castle nut illustration castle nut illustration A slotted nut that allows insertion of a cotter pin to prevent rotation. Usually manufactured from metal with various sizes.

Examples of how the word is used

castle nut illustration A slotted nut (sometimes called a castle nut because it resembles the top of a castle) is a nut that is designed to be held in place with a cotter pin.
castle nut illustration What size is the castle nut on the front wheels?