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phosphorescent, and is only moderately active chemically. It is valuable as a chemical reagent, and is used in the composition of the friction surface on which safety matches are ignited. -- Solar phosphori (Chem.), phosphorescent substances which shine in the dark after exposure to the sunlight or other intense ligh…

d malleable, but very infusible, and characterized by its resistance to strong chemical reagents. It is used for crucibles, for stills for sulphuric acid, rarely for coin, and in the form of foil and wire for many purposes. Specific gravity 21.5. Atomic weight 194.3. Symbol Pt. Formerly called platina. Platinum black (…

Any agent which, when introduced into the animal organism, is capable of producing a morbid, noxious, or deadly effect upon it; as, morphine is a deadly poison; the poison of pestilential diseases.

The agent exercising an ability to act; an individual invested with authority; an institution, or government, which exercises control; as, the great powers of Europe; hence, often, a superhuman agent; a spirit; a divinity. "The powers of darkness." Milton. And the powers of the heavens shall be shaken. Matt. xxiv. 29.…

An agent or confederate in treachery. [Obs.] Shak.

Any force or reagent which causes the formation of a precipitate.

insoluble substance separated from a solution in a concrete state by the action of some reagent added to the solution, or of some force, such as heat or cold. The precipitate may fall to the bottom (whence the name), may be diffused through the solution, or may float at or near the surface. Red precipitate (Old. Chem),…

nts before they take place; foresight. God's certain prescience of the volitions of moral agents. J. Edwards.

That which preserves, or has the power of preserving; a presevative agent. To wear tablets as preservatives against the plague. Bacon.

Usually Press work. The work of a press agent. [Chiefly Theat. Cant]

One who employs another to act for him, -- as distinguished from an agent. Wharton. Bouvier. Burrill.

To act as a proctor toward; to manage as an attorney or agent. Bp. Warburton.

One who manages another's affairs, either generally or in a special matter; an agent; a proctor. Chaucer. Shak.

The agency for another who acts through the agent; authority to act for another, esp. to vote in a legislative or corporate capacity. I have no man's proxy: I speak only for myself. Burke.

An aqueous medicine, containing little, if any, medicinal agent; a tea or tisane.

of textures of hemp, linen, or cotton in a copper vessel, -- formerly used as a remedial agent. Dunglison.

valid; to establish; to settle; especially, to give sanction to, as something done by an agent or servant; as, to ratify an agreement, treaty, or contract; to ratify a nomination. It is impossible for the divine power to set a seal to a lie by ratifying an imposture with such a miracle. South.

ct upon each other; to exercise a reciprocal or a reverse effect, as two or more chemical agents; to act in opposition.

The mutual or reciprocal action of chemical agents upon each other, or the action upon such chemical agents of some form of energy, as heat, light, or electricity, resulting in a chemical change in one or more of these agents, with the production of new compounds or the manifestation of distinctive characters. See Blow…

, as by bleaching with mercuric chloride and subsequently subjecting anew to a developing agent. -- Re`de*vel"op*er (#), n. --Re`de*vel"op*ment (#), n.