- one of the two or more separable pieces composing certain shells.
- either half of the silicified shell of a diatom.
- one of the segments into which a capsule dehisces.
- a flap or lidlike part of certain anthers.
verb (used with object), valved, valv·ing.
- valve gear,
- valve lifter,
- valve spring,
- valve stem,
- valve trombone
Origin of valve
Examples from the Web for valve
Such and such a time, such and such a day, then trouble with the valve.Alfred Hitchcock’s Fade to Black: The Great Director’s Final Days|David Freeman|December 13, 2014|DAILY BEAST
When he finally opened the valve, he says, the team was able to cool the core for the first time since the crisis began.
People with valve problems develop heart murmurs and may eventually need valve replacement.
When the valve is in its middle position it generally more than covers the steam ports.An Introduction to Machine Drawing and Design|David Allan Low
One in which the steam pressure on the top and bottom of the valve is nearly equalized.The Traveling Engineers' Association|Anonymous
The valve and pressure gauge had been recovered after a considerable search, and the tank could be refilled with the others.The Wailing Octopus|Harold Leland Goodwin
The reader must remember that the valve shown in the section is only diagrammatic.How it Works|Archibald Williams
Having opened the vent pipe valve and relieved the pressure, open the valve in the water filling tube.Oxy-Acetylene Welding and Cutting|Harold P. Manly
- any of the several parts that make up a dry dehiscent fruit, esp a capsule
- either of the two halves of a diatom cell wall
Word Origin for valve
late 14c., "one of the halves of a folding door," from Latin valva "section of a folding or revolving door," literally "that which turns," related to volvere "to roll" (see volvox). Sense extended 1610s to "membranous fold regulating flow of bodily fluids;" 1650s to "mechanical device that works like a valve;" and 1660s in zoology to "halves of a hinged shell."
- Any of various mechanical devices that control the flow of liquids, gases, or loose material through pipes or channels by blocking and uncovering openings.
- The movable part or element of such a device.