Armor-piercing, fin-stabilized, discarding-sabot/Definition

The most potent antitank gun ammunition against heavy armor, used as the main battle tank round by all industrialized nations other than the U.K.; consists of a ultrahard metal dart that does not spin, but has stabilizing fins; the "dart" is much thinner than the gun barrel, and a sabot, or collar that falls away as the round leaves the barrel, allows great pressure to be exerted on the dart base