hydrium

English

Noun

hydrium (uncountable)

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

References

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