valve - definition and synonyms

noun [countable] 

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  1. 1
    the part of a machine or piece of equipment that opens and closes in order to control the flow of air or liquid
  2. 2
    the part of an organ or tube in your body that opens and closes to keep liquid flowing in the right direction
  3. 3
    music the part of some musical instruments that opens and closes to change the sound of the note