hydrogen

Etymology

From French hydrogène, coined by Louis-Bernard Guyton de Morveau, from Ancient Greek ὕδωρ (húdōr, “water”) + γεννάω (gennáō, “I bring forth”). Corresponding to hydro- + -gen.

noun

  1. The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.00794.
    For quotations using this term, see Citations:hydrogen.
    1. An atom of the element.
  2. Molecular hydrogen (H₂), a colourless, odourless and flammable gas at room temperature.
    1. A molecule of this molecular species
  3. A sample of the element/molecule.

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