1. any device for halting or controlling the flow of a liquid, gas, or other material through a passage, pipe, inlet, outlet, etc.
2. a hinged lid or other movable part that closes or modifies the passage in such a device.
3. Anatomy. a membranous fold or other structure that controls the flow of a fluid, as one that permits blood to flow in one direction only.
4. (in musical wind instruments of the trumpet class) a device for changing the length of the air column to alter the pitch of
"surgeries can be valve."
"sounds can be valve."
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