valve [countable]
1 a part of a tube or pipe that opens and shuts like a door to control the flow of liquid, gas, air etc passing through it :
heart valves
2 the part on a trumpet or similar musical instrument that you press to change the sound of the note
3 British English a closed glass tube used to control the flow of electricity in old radios, televisions etc [= vacuum tube American English]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary
Advanced Learner's Dictionary
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