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A dark brown powder containing iron, prepared by the action of zinc dust as a reducing agent upon the coloring matter of the blood, used medicinally as a hematinic.

An agent; a servant, or laborer; a workman, trained or competent for special service or duty; a performer more or less skillful; as, a deck hand; a farm hand; an old hand at speaking. A dictionary containing a natural history requires too many hands, as well as too much time, ever to be hoped for. Locke. I was always r…

A dog of hell; an agent of hell. A hellhound, that doth hunt us all to death. Shak.

erest of (any one) for a specific purpose, by payment of wages; as, to hire a servant, an agent, or an advocate.

The male of a pair of animals. [R.] Dryden. A ship's husband (Naut.), an agent representing the owners of a ship, who manages its expenses and receipts.

ungent, colorless gas, HI, usually prepared as a solution in water. It is strong reducing agent. Called also hydrogen iodine.

e is a strong solution of the gas in water. It is a typical acid, and is an indispensable agent in commercial and general chemical work. Called also muriatic, and chlorhydric, acid.

collected as a solution in water. It attacks all silicates, as glass or porcelain, is the agent employed in etching glass, and is preserved only in vessels of platinum, lead, caoutchouc, or gutta-percha.

Tending to remove or separate water; eliminating water. Hydrolytic agents, such as sulphuric acid or caustic alkali. Encyc. Brit. Hydrolitic ferment (Physiol. Chem.), a ferment, enzyme, or chemical ferment, which acts only in the presence of water, and which causes the substance acted upon to take up a molecule of wate…

Of or pertaining to hydrometallurgy; involving the use of liquid reagents in the treatment or reduction of ores. -- Hy`dro*met`al*lur"gic*al*ly, adv.

The art or process of assaying or reducing ores by means of liquid reagents.

usually obtained as a volatile, unstable solution in water. It acts as a strong reducing agent.

Any agent that produces, or tends to produce, sleep; an opiate; a soporific; a narcotic.

by exaporation and freezing, as a white crystalline substance. It is a powerful reducing agent.

e state, but in an orange-yellow water solution, which is a strong reducing and bleaching agent. Called also hydrosulphurous acid.

That which impels or gives an impulse; an impelling agent. Sir W. Wotton.

That which incites; an inciting agent or cause; a stimulant. E. Darwin.

ndition of acidity, alkalinity, or the deficiency, excess, or sufficiency of a standard reagent, by causing an appearance, disappearance, or change of color, as in titration or volumetric analysis.

r checking of an already present action; a restraining of the function of an organ, or an agent, as a digestive fluid or ferment, etc.; as, the inhibition of the respiratory center by the pneumogastric nerve; the inhibition of reflexes, etc.

An agent or preparation for destroying insects; an insect powder. -- In*sec"ti*ci`dal, a.