Etymology

muononium

M3U1O1N1O1N1I1U1M3

Today it means: an exotic atom formed when an antimuon and a muon are bound by their mutual electrical attraction Full definition →

English onium
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The story

  1. Englishmuon
  2. Englishonium
  3. English todaymuononium

From muon + -onium.

Etymology from Wiktionary, CC BY-SA 4.0.