The valved doors are continually opening and partly closing, and if we listen quietly we can hear a perpetual shuss!
It has been superseded by the development of the valved tubas.
The author of this book has tried one of these “valved openings” recommended by Dr. Arnott, and has found it answer very well.
Miser, mīz′ėr, n. a tubular well boring-bit, with valved opening for the earth passing up.
The capsule is five-celled, and five or ten valved, the valves opening lengthways.
Terebrantia: Hymenoptera with sessile abdomen and valved ovipositors: Thripids in which the ovipositor of female is borer-like.
Capsule 3- (rarely 5-) valved; the valves bearing the numerous seeds on their middle for the whole length.
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."
A membranous structure in a hollow organ or passage, as in an artery or a vein, that folds or closes to prevent the return flow of the body fluid passing through it.
Any of various devices that regulate the flow of gases, liquids, or loose materials through piping or through apertures by opening, closing, or obstructing ports or passageways.
The movable control element of such a device.