Etymology

helonium

H4E1L1O1N1I1U1M3

Today it means: Synonym of helium hydride. Full definition →

English onium ← New Latin ammōnium ← Ancient Greek ἥλιος (hḗlios)
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The story

  1. Proto-Indo-European*sóh₂wl̥
  2. Proto-Indo-European*sh₂wél(i)yos
  3. Proto-Hellenic*hāwélios
  4. Ancient Greekἥλιος (hḗlios)
  5. New Latinhelium
  6. Englishhelium
  7. New Latinammōnium
  8. Englishammonium
  9. Englishonium
  10. English todayhelonium

From helium + -onium.

Etymology from Wiktionary, CC BY-SA 4.0.