English definition of Valve

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Definition of valve

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Valve (n.) A lid, plug, or cover, applied to an aperture so that by its movement, as by swinging, lifting and falling, sliding, turning, or the like, it will open or close the aperture to permit or prevent passage, as of a fluid..

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Dreissena :: Dreissena (n.) A genus of bivalve shells of which one species (D. polymorpha) is often so abundant as to be very troublesome in the fresh waters of Europe.

Valve :: Valve (n.) One of the pieces or divisions of bivalve or multivalve shells.

Trivalve :: Trivalve (n.) Anything having three valves, especially a shell..

Seat :: Seat (n.) A part or surface on which another part or surface rests; as, a valve seat..

Organ :: Organ (n.) A component part performing an essential office in the working of any complex machine; as, the cylinder, valves, crank, etc., are organs of the steam engine..

Marginella :: Marginella (n.) A genus of small, polished, marine univalve shells, native of all warm seas..

Anodon :: Anodon (n.) A genus of fresh-water bivalves, having no teeth at the hinge..

Melon :: Melon (n.) A large, ornamental, marine, univalve shell of the genus Melo..

Ostrea :: Ostrea (n.) A genus of bivalve Mollusca which includes the true oysters.

Veliger :: Veliger (n.) Any larval gastropod or bivalve mollusk in the state when it is furnished with one or two ciliated membranes for swimming.

Sluice :: Sluice (n.) An artifical passage for water, fitted with a valve or gate, as in a mill stream, for stopping or regulating the flow; also, a water gate or flood gate..

Action :: Action (n.) The mechanical contrivance by means of which the impulse of the player's finger is transmitted to the strings of a pianoforte or to the valve of an organ pipe.

Concho-spiral :: Concho-spiral (n.) A kind of spiral curve found in certain univalve shells.

Gyration :: Gyration (n.) One of the whorls of a spiral univalve shell.

Tube-shell :: Tube-shell (n.) Any bivalve mollusk which secretes a shelly tube around its siphon, as the watering-shell..

Beard :: Beard (n.) The gills of some bivalves, as the oyster..

Septifragal :: Septifragal (a.) Breaking from the partitions; -- said of a method of dehiscence in which the valves of a pod break away from the partitions, and these remain attached to the common axis..

Rudistes :: Rudistes (n. pl.) An extinct order or suborder of bivalve mollusks characteristic of the Cretaceous period; -- called also Rudista. See Illust. under Hippurite.

Holostomatous :: Holostomatous (a.) Having an entire aperture; -- said of many univalve shells.

Bivalvular :: Bivalvular (a.) Having two valves.