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A gaseous element, colorless, tasteless, and odorless, the lightest known substance, being fourteen and a half times lighter than air (hence its use in filling balloons), and over eleven thousand times lighter than water. It is very abundant, being an ingredient of water and of many other substances, especially those o…

To hydrogenize.

The act of combining with hydrogen, or the state of being so combined.

A binary compound containing hydrogen; a hydride. [R.] See Hydride.

Hydrogen; -- called also in view of its supposed metallic nature. Graham.

To combine with hydrogen; to treat with, or subject to the action of, hydrogen; to reduce; -- contrasted with oxidize.

Of or pertaining to hydrogen; containing hydrogen.

To deprive of, or free from, hydrogen.

The act or process or freeing from hydrogen; also, the condition resulting from the removal of hydrogen.

Of or pertaining to a mixture of oxygen and hydrogen; as, oxyhydrogen gas. Oxyhydrogen blowpipe. (Chem.) See Blowpipe. -- Oxyhydrogen microscope, a form of microscope arranged so as to use the light produced by burning lime or limestone under a current of oxyhydrogen gas.

A light produced by the incandescence of some substances, esp. lime, in the oxyhydrogen flame. Coal gas (producing the oxygas light), or the vapor of ether (oxyether light) or methylated spirit (oxyspirit light), may be substituted for hydrogen.

A white crystalline solid, from ammonia by replacement of an equivalent of hydrogen by acetyl.

A volatile liquid consisting of three parts of carbon, six of hydrogen, and one of oxygen; pyroacetic spirit, -- obtained by the distillation of certain acetates, or by the destructive distillation of citric acid, starch, sugar, or gum, with quicklime.

A complex, hypothetical radical, composed of two parts of carbon to three of hydrogen and one of oxygen. Its hydroxide is acetic acid.

A gaseous compound of carbon and hydrogen, in the proportion of two atoms of the former to two of the latter. It is a colorless gas, with a peculiar, unpleasant odor, and is produced for use as an illuminating gas in a number of ways, but chiefly by the action of water on calcium carbide. Its light is very brilliant. W…

em to form salts, at the same time losing their own peculiar properties. They all contain hydrogen, united with a more negative element or radical, either alone, or more generally with oxygen, and take their names from this negative element or radical. Those which contain no oxygen are sometimes called hydracids in dis…

the price of stocks or public funds. Vanity and agiotage are to a Parisian the oxygen and hydrogen of life. Landor.

One of a series of compounds that may be regarded as ammonia in which a part of the hydrogen has been replaced by basic, and another part by acid, atoms or radicals.

A compound formed from the hydrate of aluminium by the substitution of a metal for the hydrogen.

with an acid element or radical. It may also be regarded as ammonia in which one or more hydrogen atoms have been replaced by an acid atom or radical. Acid amide, a neutral compound formed by the substitution of the amido group for hydroxyl in an acid.