hydrogen
Pronunciation
  • (RP) IPA: /ˈhaɪdɹədʒ(ə)n/
  • (GA) enPR: hī'drəjən, IPA: /ˈhaɪdɹədʒən/
Noun

hydrogen

  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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