castle nut

noun

castellated nut.

Origin of castle nut

First recorded in 1900–05

Words nearby castle nut

casting vote, casting wheel, castle, castle howard, castle in the air, castle nut, castle peak, castle shannon, castle walk, castle's intrinsic factor, castle, the

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