Dictionary > English Dictionary > Definition, synonym and antonym of hydrogen
Meaning of hydrogen by Wiktionary Dictionary


    Chemical elementHNext: helium ( He )


    From French hydrogène, coined by Louis-Bernard Guyton de Morveau, from Ancient Greek ὕδωρ ( hudōr, “water” ) + γεννάω ( gennaō, “I bring forth” ) .


    • IPA: /ˈhaɪdɹədʒən/
    • Hyphenation: hy‧dro‧gen


    hydrogen ( plural: hydrogens )

    1. The lightest chemical element ( symbol H ) with an atomic number of 1 and atomic weight of 1.00794 .
    2. Molecular hydrogen ( H2 ), a colourless, odourless and flammable gas at room temperature .
    3. An atom of the element .
    4. A sample of the element .

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Explanation of hydrogen by Wordnet Dictionary


    1. a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas

    Definition of hydrogen by GCIDE Dictionary


    1. Hydrogen n. [Hydro-, 1 + -gen: cf. F. hydrogène. So called because water is generated by its combustion. See Hydra.] ( Chem. ) 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.

      ☞ Although a gas, hydrogen is chemically similar to the metals in its nature, having the properties of a weak base. It is, in all acids, the base which is replaced by metals and basic radicals to form salts. Like all other gases, it is condensed by great cold and pressure to a liquid which freezes and solidifies by its own evaporation. It is absorbed in large quantities by certain metals ( esp. palladium ), forming alloy-like compounds; hence, in view of quasi-metallic nature, it is sometimes called hydrogenium. It is the typical reducing agent, as opposed to oxidizers, as oxygen, chlorine, etc.

      Bicarbureted hydrogen, an old name for ethylene. -- Carbureted hydrogen gas. See under Carbureted. -- Hydrogen dioxide, a thick, colorless liquid, H2O2, resembling water, but having a bitter, sour taste, produced by the action of acids on barium peroxide. It decomposes into water and oxygen, and is manufactured in large quantities for an oxidizing and bleaching agent. Called also oxygenated water .