Etymology
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silencer (n.)

c. 1600, "person who silences," agent noun from silence (v.). Meaning "mechanism that stifles the sound of a motor or firearm" is from 1898.

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Definitions of silencer

silencer (n.)
short tube attached to the muzzle of a gun that deadens the sound of firing;
silencer (n.)
a tubular acoustic device inserted in the exhaust system that is designed to reduce noise;
Synonyms: muffler
From wordnet.princeton.edu