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valve

 
 
pronunciation:
vaelv
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part of speech: noun
definition 1: A valve is a thing that controls the flow of a liquid or gas through a pipe or a tube. The more you open a valve, the more liquid or gas can go through. If you close the valve, the liquid or gas stops flowing.
The plumber closed the valve before repairing the faucet.
 
definition 2: A valve is a flap that controls the flow of a liquid in the body of a human or animal.
The human heart has four valves. They control the flow of blood through the heart.
similar words:
quality
definition 3: A valve is a device that controls the flow of air in a musical instrument such as the trumpet or trombone. A valve makes the sound of the instrument higher or lower. Valves operate by pressing down on them.
Some tubas have only three valves, and some have as many as six valves. Tubas used by students usually have only three valves.
derivations: valveless (adj.), valvelike (adj.)
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