Definition of valve noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//vælv//
    ; NAmE NAmE//vælv//
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  1. 1a device for controlling the flow of a liquid or gas, letting it move in one direction only The plumber will fit some new safety valves. You need special tools to open the valve.
  2. 2a structure in the heart or in a vein that lets blood flow in one direction only
  3. 3a device in some brass musical instruments for changing the note
  4. Word Originlate Middle English (denoting a leaf of a folding or double door): from Latin valva.
See the Oxford Advanced American Dictionary entry: valve

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