Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun physics, chemistry an exotic atom equivalent to a hydrogen atom with the proton replaced by a pion
  • noun physics an onium where the bound antiparticle-particle pair is a pion and an antipion.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

pion +‎ -ium

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