What is the meaning of Silencer?

Something that silences

  1. An attachment to a gun or an exhaust pipe that reduces the sound it emits
  2. The muffler of an internal combustion engine.
  3. Any of various devices to silence the humming noise of telegraph wires
  4. Something that prevents gene expression

An attachment to a gun or an exhaust pipe that reduces the sound it emits

The muffler of an internal combustion engine.

Any of various devices to silence the humming noise of telegraph wires

Something that prevents gene expression

Source: wiktionary.org