hydrogen
1. A gaseous element, atomic no. 1, atomic wt. 1.00794. 2. The molecular form (H2) of the element. SYN: dihydrogen. [hydro- + G. -gen, producing]
- activated h. h. removed by a dehydrogenase, e.g., via a flavoprotein, from a metabolite for transference to another substance with which it combines.
- arseniureted h. SYN: arsine.
- h. bromide HBr; a colorless gas that has a very irritating odor and fumes in moist air; in aqueous solution, it is hydrobromic acid.
- h. chloride HCl; a very soluble gas which, in solution, forms hydrochloric acid.
- h. dehydrogenase a flavoprotein catalyzing the conversion of NAD+ to NADH by molecular h. (H2); i.e., H2 + NAD+H+ + NADH.
- h. dioxide SYN: h. peroxide.
- heavy h. SYN: h.-2.
- h. peroxide an unstable compound readily broken down to water and oxygen, a reaction catalyzed by various powdered metals and by the enzyme, catalase; a 3% solution is used as a mild antiseptic for skin and mucous membranes. SYN: h. dioxide, hydroperoxide.
- h. phosphide SYN: phosphine.
- phosphureted h. SYN: phosphine.
- h. sulfide H2S; a colorless, flammable, toxic gas with a familiar “rotten egg” odor, formed in the decomposition of organic matter containing sulfur; used as a reagent, and in the manufacture of chemicals. SYN: sulfureted h..
- sulfureted h. SYN: h. sulfide.

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hy·dro·gen 'hī-drə-jən n a nonmetallic element that is the simplest and lightest of the elements and that is normally a colorless odorless highly flammable diatomic gas symbol H see DEUTERIUM, TRITIUM ELEMENT (table)
hy·drog·e·nous hī-'dräj-ə-nəs adj

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hy·dro·gen (H) (hiґdro-jən) [hydro- + Gr. gennan to produce] the lightest element, an odorless, tasteless, colorless gas that is inflammable and explosive when mixed with air. It is found in water and in almost all organic compounds. Its ion is the active constituent of all acids in the water system. Atomic number 1, atomic weight 1.00797, specific gravity 0.069. Hydrogen exists in three isotopes: ordinary, or light, hydrogen is the mass 1 isotope, also called protium; heavy hydrogen is the mass 2 isotope, also called deuterium; the mass 3 isotope is tritium.

Medical dictionary. 2011.

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  • Hydrogen — Hy dro*gen, n. [Hydro , 1 + gen: cf. F. hydrog[ e]ne. 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… …   The Collaborative International Dictionary of English

  • Hydrogen — Capture d écran …   Wikipédia en Français

  • Hydrogen 7 — steht für: den BMW Hydrogen 7, ein Wasserstofffahrzeug von BMW ein Wasserstoffisotop mit 6 Neutronen, Hydrogen 7 Diese Seite ist eine Begriffsklärung zur Unterscheidung mehrerer mit demselben Wort bezeichneter Begriffe …   Deutsch Wikipedia

  • hydrogen — 1791, from Fr. hydrogène, coined 1787 by G. de Morveau, Lavoisier, Berthollet, and Fourcroy from Gk. hydr , stem of hydros water (see WATER (Cf. water) (n.1)) + Fr. gène producing (see GEN (Cf. gen)). So called because it forms water when exposed …   Etymology dictionary

  • hydrogen — [hī′drə jən] n. [Fr hydrogène (see HYDRO & GEN): coined (1787) by L. B. Guyton de Morveau (1737 1816), Fr chemist, in reference to the generation of water from the combustion of hydrogen] a flammable, colorless, odorless, gaseous chemical element …   English World dictionary

  • Hydrogēn — Hydrogēn, Wasserstoff; Hydrogēngas, Wasserstoffgas. Hydrogēnheizung u. Hydrogēnerleuchtung, Heizung u. Beleuchtung mit Wasserstoffgas, s.d. Hydrogēnpol, der negative Pol einer galvanischen Kette, weil an ihm sich bei der Zerlegung des Wassers das …   Pierer's Universal-Lexikon

  • Hydrogen — Hydrogēn (Hydrogenĭum, grch.), Wasserstoff …   Kleines Konversations-Lexikon

  • Hydrogen — Hydrogen, griech. dtsch., Wasserstoff; H. pol, negativer Pol, s. Galvanismus …   Herders Conversations-Lexikon

  • Hydrogen... — Hydrogen...,   Präfix für die Bezeichnung saurer Salze in der anorganischen Chemie; z. B. Hydrogencarbonate, die sauren Salze der Kohlensäure, Hydrogensulfate, die sauren Salze der Schwefelsäure …   Universal-Lexikon

  • hydrogen — Symbol: H Atomic number: 1 Atomic weight: 1.0079 Colourless, odourless gaseous chemical element. Lightest and most abundant element in the universe. Present in water and in all organic compounds. Chemically reacts with most elements. Discovered… …   Elements of periodic system

  • hydrogen — ► NOUN ▪ a colourless, odourless, highly flammable gas which is the lightest of the chemical elements …   English terms dictionary

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