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valve
noun
1
a any device that regulates the flow of a liquid or gas through a pipe by opening or closing an aperture;
b any such device that allows flow in one direction only.
2 anat in certain tubular organs: a flap of membranous tissue that allows flow of a body fluid, such as blood, in one direction only, eg the valves in the heart and veins.
3 electronics a thermionic valve.
4 any of a set of finger-operated devices that control the flow of air through some brass musical instruments producing different notes.
5 bot any of the sections that are formed when a capsule or other dry fruit opens to shed its seeds at dehiscence.
6 zool either half of the hinged shell of a bivalve mollusc such as a cockle or clam.
[14c: from Latin valva folding door]
valved adjective .
noun
1
a any device that regulates the flow of a liquid or gas through a pipe by opening or closing an aperture;
b any such device that allows flow in one direction only.
2 anat in certain tubular organs: a flap of membranous tissue that allows flow of a body fluid, such as blood, in one direction only, eg the valves in the heart and veins.
3 electronics a thermionic valve.
4 any of a set of finger-operated devices that control the flow of air through some brass musical instruments producing different notes.
5 bot any of the sections that are formed when a capsule or other dry fruit opens to shed its seeds at dehiscence.
6 zool either half of the hinged shell of a bivalve mollusc such as a cockle or clam.
[14c: from Latin valva folding door]
valved adjective .
© Hodder Education
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