concentrator

Noun

 * 1) One who concentrates.
 * 2)  A hub.
 * 3)  An apparatus for the separation of dry comminuted ore, by exposing it to intermittent puffs of air.
 * 4)  A frame or ring of wire or hard paper fitting into the cartridge case used in some shotguns, and holding the shot together when discharged, to secure close shooting; also, a device for slightly narrowing the bore at the muzzle for the same purpose.
 * 1)  A frame or ring of wire or hard paper fitting into the cartridge case used in some shotguns, and holding the shot together when discharged, to secure close shooting; also, a device for slightly narrowing the bore at the muzzle for the same purpose.