Etymology

positronium

P3O1S1I1T1R1O1N1I1U1M3

Today it means: An exotic atom (specifically, an onium) consisting of a positron (antielectron) and an electron, as a particle–anti-particle bound pair with no nucleus. Full definition →

English onium
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The story

  1. Englishpositr(on)
  2. Englishonium
  3. English todaypositronium

From positr(on) + -onium.

Etymology from Wiktionary, CC BY-SA 4.0.