from The Century Dictionary.

  • noun Hydrogen regarded as a metal; solidified hydrogen.
  • noun Hydrogen occluded by palladium. See occlusion.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Chem.) Hydrogen; -- called also in view of its supposed metallic nature.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun obsolete, chemistry hydrogen, especially when formerly considered as a metal


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