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hydrogen
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English Dictionary: hydrogen by the DICT Development Group
3 results for hydrogen
From WordNet (r) 3.0 (2006) [wn]:
hydrogen
n
  1. 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
    Synonym(s): hydrogen, H, atomic number 1
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Hydrogen \Hy"dro*gen\, n. [Hydro-, 1 + -gen: cf. F.
      hydrog[8a]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 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.

From The Elements (22Oct97) [elements]:
   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 by Henry
   Cavendish in 1776.
  
  
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