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Noun

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hydrium (uncountable)

  1. (obsolete, chemistry) hydrogen [1]
  2. (rare, chemistry) protium [2]

References

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  1. ^ Fireside Science, What is Water?, 1872
  2. ^ "Alkylation of Alkanes", by Gustav Egloff & George Hulla, published by Reinhold Pub. Corp., '1948'