a shoe made of a single block of wood hollowed out, worn esp. by farmers and workers in the Netherlands, France, Belgium, etc.

a shoe with a thick wooden sole and sides and a top of coarse leather.

Military .

a wooden or metal disk formerly attached to a projectile in a muzzleloading cannon.

a soft metal ring at the base of a projectile that makes the projectile conform to the rifling grooves of a gun.