volume control

Definitions

General Science

  • noun a knob used to adjust the sound on a device by making it louder or less loud

Electronics

  • A control, such as that of a TV or stereo amplifier, which varies volume (1). Also called loudness control.

Information & Library Science

  • noun a device that enables the user to control the loudness of the noise produced
http://www.dictionarycentral.com/definition/volume-control.html