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ly, the amount required on one side or the other to make such an equilibrium. -- Balance valve, a valve whose surfaces are so arranged that the fluid pressure tending to seat, and that tending to unseat the valve, are nearly in equilibrium; esp., a puppet valve which is made to operate easily by the admission of steam…

distinguished from a blank cartridge, containing only powder. -- Ball cock, a faucet or valve which is opened or closed by the fall or rise of a ball floating in water at the end of a lever. -- Ball gudgeon, a pivot of a spherical form, which permits lateral deflection of the arbor or shaft, while retaining the pivo…

as in the Hemiptera. (d) The upper or projecting part of the shell, near the hinge of a bivalve. (e) The prolongation of certain univalve shells containing the canal.

A large bivalve shell of the East Indies (Hippopus maculatus), often used as an ornament.

The gills of some bivalves, as the oyster.

A genus of fossil univalve shells, believed to belong to the Heteropoda, peculiar to the Paleozoic age.

ternate expansion and contraction, or by rise and fall of the top, draws in air through a valve and expels it through a tube for various purposes, as blowing fires, ventilating mines, or filling the pipes of an organ with wind. Bellows camera, in photography, a form of camera, which can be drawn out like an accordion o…

Having two adductor muscles, as a bivalve mollusk.

Having two valves.

w out. (a) To be driven out by the expansive force of a gas or vapor; as, a steam cock or valve sometimes blows out. (b) To talk violently or abusively. [Low] -- To blow over, to pass away without effect; to cease, or be dissipated; as, the storm and the clouds have blown over. -- To blow up, to be torn to pieces and…

A marine univalve shell of the genus Cymba.

A glandular organ of bivalve mollusca, serving in part as a kidney.

In pumps, a metal covering for the openings in the valve chambers.

A marine, bivalve mollusk, of the genus Teredo and allies, which burrows in wood. See Teredo.

A chamber or section of tube in which a valve works; the bucket of a lifting pump.

A class of Molluscoidea having a symmetrical bivalve shell, often attached by a fleshy peduncle.

A marine univalve shell of the genus Bulla and allied genera, belonging to the Tectibranchiata.

Resembling the genus Buccinum, or pertaining to the Buccinidæ, a family of marine univalve shells. See Whelk, and Prosobranchiata.

A genus of large univalve mollusks abundant in the arctic seas. It includes the common whelk (B. undatum).

The valved piston of a lifting pump. Fire bucket, a bucket for carrying water to put out fires. -- To kick the bucket, to die. [Low]