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valve

valve /ˈvælv/ noun
plural valves
valve
/ˈvælv/
noun
plural valves
Britannica Dictionary definition of VALVE
[count]
: a mechanical device that controls the flow of liquid, gas, etc., by opening and closing see picture at plumbing; see also safety valve
: a device in some musical instruments (such as trumpets) that you press to play different notes see picture at brass instrument
medical : a structure in the heart, stomach, etc., that temporarily stops the flow of fluid or that allows fluid to move in one direction only
British : vacuum tube