valve
any device for halting or controlling the flow of a liquid, gas, or other material through a passage, pipe, inlet, outlet, etc.
a hinged lid or other movable part that closes or modifies the passage in such a device.
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.
(in musical wind instruments of the trumpet class) a device for changing the length of the air column to alter the pitch of a tone.
Zoology.
one of the two or more separable pieces composing certain shells.
either half of the silicified shell of a diatom.
Botany.
one of the segments into which a capsule dehisces.
a flap or lidlike part of certain anthers.
Electronics (chiefly British). vacuum tube (def. 1).
Archaic. one of the leaves of a double or folding door.
to provide with a means of controlling the flow of liquid, gas, etc., by inserting a valve.
Origin of valve
1Other words from valve
- valveless, adjective
- valvelike, adjective
- un·der·valve, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use valve in a sentence
If a valveless hot tube be employed it may happen that the incandescent zone is too near the base.
Gas-Engines and Producer-Gas Plants | R. E. MathotAgain, they may be divided into those that are valveless, with the differential piston or hammer itself acting as a valve.
Expository Writing | Mervin James CurlThis valveless percolator is very easily cleaned and requires no brush.
The Wonder Book of Knowledge | Various
British Dictionary definitions for valve
/ (vælv) /
any device that shuts off, starts, regulates, or controls the flow of a fluid
anatomy a flaplike structure in a hollow organ, such as the heart, that controls the one-way passage of fluid through that organ
Also called: tube, vacuum tube an evacuated electron tube containing a cathode, anode, and, usually, one or more additional control electrodes. When a positive potential is applied to the anode, electrons emitted from the cathode are attracted to the anode, constituting a flow of current which can be controlled by a voltage applied to the grid to produce amplification, oscillation, etc: See also diode (def. 2), triode (def. 1), tetrode, pentode
zoology any of the separable pieces that make up the shell of a mollusc
music a device on some brass instruments by which the effective length of the tube may be varied to enable a chromatic scale to be produced
botany
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
archaic a leaf of a double door or of a folding door
Origin of valve
1Derived forms of valve
- valveless, adjective
- valvelike, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for valve
[ vălv ]
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.
Any of various structures that prevent the backward flow of a body fluid, such as blood or lymph. Valves in the heart, veins, and lymphatic vessels contain flaps (known as cusps) that close in response to pressure created by the backflow of fluid.
One of the paired hinged shells of certain mollusks, such as clams and oysters.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Browse