Sabot n. : A kind of wooden shoe worn by the peasantry in France, Belgium, Sweden, and some other European countries.

Sabot n. : A thick, circular disk of wood, to which the cartridge bag and projectile are attached, in fixed ammunition for cannon; also, a piece of soft metal attached to a projectile to take the groove of the rifling.

Example:
What would happen if I shoot Sabot slugs thru smooth barrel?

Taxonomy
sabot, projectile, cup, Armour-piercing discarding sabot, DISCARDING SABOT, spindle, barrel, shotgun, flechettes, free encyclopedia, gun, fire, firing, shotgun slugs, wooden shoe, separation, gas, hunting shotgun.

Defination from the web:
sabot (pronounced /ˈseɪboʊ/ SAY-boh or /ˈsæboʊ/ SAB-oh) is a device used in a firearm or cannon to fire a projectile, such as a bullet, that is ... When the projectile is fired, the sabot blocks the gas, and accelerates the projectile down the barrel. ...