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assage; passable; penetrable; -- used especially of substances which allow the passage of fluids; as, wood is permeable to oil; glass is permeable to light. I. Taylor.

etrate and pass through without causing rupture or displacement; -- applied especially to fluids which pass through substances of loose texture; as, water permeates sand. Woodward.

To excrete matter through the skin; esp., to excrete fluids through the pores of the skin; to sweat.

Any one of the colored substances found in animal and vegetable tissues and fluids, as bilirubin, urobilin, chlorophyll, etc.

A clamp on a flexible pipe to regulate the flow of a fluid through the pipe.

Simmering; boiling; sizzling; hissing; -- from the sound of boiling fluids. Piping crow, Piping crow shrike, Piping roller (Zoöl.), any Australian bird of the genus Gymnorhina, esp. G. tibicen, which is black and white, and the size of a small crow. Called also caruck. -- Piping frog (Zoöl.), a small American tree fro…

A sliding piece which either is moved by, or moves against, fluid pressure. It usually consists of a short cylinder fitting within a cylindrical vessel along which it moves, back and forth. It is used in steam engines to receive motion from the steam, and in pumps to transmit motion to a fluid; also for other purposes.…

nning water, by placing the curved end under water, and observing the height to which the fluid rises in the tube; a kind of current meter.

In embryonic development, a vesicle filled with fluid, formed from the morula by the divergence of its cells in such a manner as to give rise to a central space, around which the cells arrange themselves as an envelope; an embryonic form intermediate between the morula and gastrula. Sometimes used as synonymous with ga…

n, used as a substitute for ointments. U. S. Disp. Blood plasma (Physiol.), the colorless fluid of the blood, in which the red and white blood corpuscles are suspended. -- Muscle plasma (Physiol.), the fundamental part of muscle fibers, a thick, viscid, albuminous fluid contained within the sarcolemma, which on the de…

To thrust or cast one's self into water or other fluid; to submerge one's self; to dive, or to rush in; as, he plunged into the river. Also used figuratively; as, to plunge into debt. Forced to plunge naked in the raging sea. Dryden. To plunge into guilt of a murther. Tillotson.

Consisting of, or resembling, air; having the properties of an elastic fluid; gaseous; opposed to dense or solid. The pneumatical substance being, in some bodies, the native spirit of the body. Bacon.

That branch of science which treats of the mechanical properties of air and other elastic fluids, as of their weight, pressure, elasticity, etc. See Mechanics.

The doctrine of, or a treatise on, air and other elastic fluids. See Pneumatics, 1.

in type, etc. (see citation); as, a polytype in relief. By pressing the wood cut into semifluid metal, an intaglio matrix is produced: and from this matrix, in a similar way, a polytype in relief is obtained. Hansard.

interstices in the skin or in the substance of the body; having spiracles or passages for fluids; permeable by liquids; as, a porous skin; porous wood. "The veins of porous earth." Milton.

A passageway in a machine, through which a fluid, as steam, water, etc., may pass, as from a valve to the interior of the cylinder of a steam engine; an opening in a valve seat, or valve face. Air port, Bridle port, etc. See under Air, Bridle, etc. -- Port bar (Naut.), a bar to secure the ports of a ship in a gale. -…

tion of the piston, as the pressure of exhaust steam which does not find free outlet. -- Fluid pressure, pressure like that exerted by a fluid. It is a thrust which is normal and equally intense in all directions around a point. Rankine. -- Pressure gauge, a gauge for indicating fluid pressure; a manometer.…

d by man to the production of power. Especially: Muscular force; the weight and motion of fluids, as water and air; heat obtained by chemical combination, and applied to produce changes in the volume and pressure of steam, air, or other fluids; and electricity, obtained by chemical action, and applied to produce altern…

An amorphous nitrogenous substance found in the spermatic fluid of salmon. It is soluble in water, which an alkaline reaction, and unites with acids and metallic bases.