sabot

noun, plural sab·ots [sab-ohz; French sa–boh] /ˈsæb oʊz; French saˈboʊ/.

1. a shoe made of a single block of wood hollowed out, worn especially by farmers and workers in the Netherlands, France, Belgium, etc.
2. a shoe with a thick wooden sole and sides and a top of coarse leather.
3. Military.
   1. a wooden or metal disk formerly attached to a projectile in a muzzleloading cannon.
   2. a soft metal ring at the base of a projectile that makes the projectile conform to the rifling grooves of a gun.

noun

1. a shoe made from a single block of wood
2. a shoe with a wooden sole and a leather or cloth upper
3. a lightweight sleeve in which a subcalibre round is enclosed in order to make it fit the rifling of a firearm. After firing the sabot drops away
4. Australian a small sailing boat with a shortened bow