An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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-ium
  -یوم  
-iom (#)
Fr.: -ium  

  1. A suffix occurring in names of → chemical elements, such as → barium, → sodium, → titanium, → uranium. Variant -um, as in → lanthanum.

  2. It also occurs in names of chemical radicals (ammonium, carbonium) and ions of complex cations (imidazolium, nitrosylium, pyridinium).

See also: From L. suffix forming certain neuter nouns (odium, tedium, colloquium; equilibrium, millennium; collegium, consortium), from Gk. -ion.