Lexic.us

Definition of Hydrogen

1. Noun. A nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe.

Definition of Hydrogen

1. n. 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 of animal or vegetable origin. It may by produced in many ways, but is chiefly obtained by the action of acids (as sulphuric) on metals, as zinc, iron, etc. It is very inflammable, and is an ingredient of coal gas and water gas. It is standard of chemical equivalents or combining weights, and also of valence, being the typical monad. Symbol H. Atomic weight 1.

Definition of Hydrogen

1. Noun. The lightest chemical element (''symbol'' H) with an atomic number of 1 and atomic weight of 1.00794. ¹

2. Noun. Molecular hydrogen (H₂), a colourless, odourless and flammable gas at room temperature. ¹

3. Noun. An atom of the element. ¹

4. Noun. A sample of the element. ¹

¹ Source: wiktionary.com

Definition of Hydrogen

1. a gaseous element [n -S]

Medical Definition of Hydrogen

1. Hydrogen is a gas element which has an atomic number of 1 and an atomic weight of 1.0079. It combines with oxygen to form water (H20) and is present in all organic compounds. A few types of bacteria can metabolise atmospheric hydrogen (H2). Hydrogen gas itself is not poisonous, but when it mixes with air it can easily ignite or explode. Hydrogen was discovered by Henry Cavendish in 1766 and was named by Lavoisier. There are two main isotopes of hydrogen: deuterium (2H) and tritium (3H, which is radioactive and is used in some glow-in-the-dark paints and as a tracer in biological studies). Abbreviation: H (09 Oct 1997)

Lexicographical Neighbors of Hydrogen

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