Etymology

bottomonium

B3O1T1T1O1M3O1N1I1U1M3

Today it means: Any meson, such as an upsilon particle, formed from a bottom quark and its antiquark. Full definition →

English onium ← Middle English botme ← Old English botm
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The story

  1. Proto-Indo-European*dʰewbʰ-?
  2. Proto-Indo-European*bʰudʰmḗn
  3. Proto-Germanic*butmaz
  4. Proto-West Germanic*botm
  5. Old Englishbotm
  6. Middle Englishbotme
  7. Englishbottom
  8. Englishonium
  9. English todaybottomonium

From bottom + -onium.

Etymology from Wiktionary, CC BY-SA 4.0.