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A firearm which receives its load at the breech. For cavalry, the revolver and breechloader will supersede the saber. Rep. Sec. War (1860).

The firing pin of a breechloader. Plunger bucket, a piston, without a valve, in a pump. -- Plunger pole, the pump rod of a pumping engine. -- Plunger pump, a pump, as for water, having a plunger, instead of a piston, to act upon the water. It may be single-acting or double- acting