What is the meaning of Mouthpiece?

A part of any device that functions in or near the mouth, especially:

  1. The part of a telephone that is held close to the mouth.
  2. The part of a wind instrument that is held in or against the mouth.

The part of a telephone that is held close to the mouth.

The part of a wind instrument that is held in or against the mouth.

A spokesman; one who speaks on behalf of someone else.

A lawyer for the defense.

Source: wiktionary.org