Si″lenc‐er (?), n. One that silences; specif.: (a) The muffler of an internal-combustion engine. (b) Any of various devices to silence the humming noise of telegraph wires. (c) A device for silencing the report of a firearm shooting its projectiles singly, as a tubular attachment for the muzzle having circular plates that permit the passage of the projectile but impart a rotary motion to, and thus retard, the exploding gases.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.