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A substance used to prevent polarization, as upon the negative plate of a voltaic battery.

To subject to plunder and pillage; to despoil; to lay waste; to prey upon. It makes the substance of the body . . . less apt to be consumed and depredated by the spirits. Bacon.

A substance so related to another substance by modification or partial substitution as to be regarded as derived from it; thus, the amido compounds are derivatives of ammonia, and the hydrocarbons are derivatives of methane, benzene, etc.

To obtain one substance from another by actual or theoretical substitution; as, to derive an organic acid from its corresponding hydrocarbon.

A genus of coleopterous insects, the larvæ of which feed animal substances. They are very destructive to dries meats, skins, woolens, and furs. The most common species is D. lardarius, known as the bacon beetle.

A substance which cleanses the skin, as water or soap; a medicine to cleanse wounds, ulcers, etc.

ich explodes with a loud report upon ignition. -- Detonating powder, any powder or solid substance, as fulminate of mercury, which when struck, explodes with violence and a loud report. -- Detonating primer, a primer exploded by a fuse; -- used to explode gun cotton in blasting operations. -- Detonating tube, a stro…

losion or sudden report made by the instantaneous decomposition or combustion of unstable substances' as, the detonation of gun cotton.

A mass of substances worn off from solid bodies by attrition, and reduced to small portions; as, diluvial detritus.

cytoplasm of an ovum or a cell, as distinguished from the active or true protoplasm; yolk substance; yolk.

A translucent, gummy, amorphous substance, nearly tasteless and odorless, used as a substitute for gum, for sizing, etc., and obtained from starch by the action of heat, acids, or diastase. It is of somewhat variable composition, containing several carbohydrates which change easily to their respective varieties of suga…

Pertaining to, or derived from, dextrose; as, dextronic acid. Dextronic acid, a sirupy substance obtained by the partial oxidation of various carbohydrates, as dextrose, etc.

The separation of different substances in solution, as crystalloids and colloids, by means of their unequal diffusion, especially through natural or artificial membranes.

Any substance, as bismuth, glass, phosphorous, etc., which in a field of magnetic force is differently affected from the ordinary magnetic bodies, as iron; that is, which tends to take a position at right angles to the lines of magnetic force, and is repelled by either pole of the magnet.

Affording a free passage to heat; as, diathermic substances. Melloni.

A rare metallic substance usually associated with the metal cerium; -- hence its name. It was formerly supposed to be an element, but has since been found to consist of two simpler elementary substances, neodymium and praseodymium. See Neodymium, and Praseodymium.

Any substance or medium that transmits the electric force by a process different from conduction, as in the phenomena of induction; a nonconductor. separating a body electrified by induction, from the electrifying body.

A strong closed vessel, in which bones or other substances may be subjected, usually in water or other liquid, to a temperature above that of boiling, in order to soften them.

A substance which, when applied to a wound or ulcer, promotes suppuration. Dunglison.

A red crystalline nitrogenous substance or artificial production, which by reduction passes directly to indigo.