Submitted by György Chityil ... on Fri, 01/19/2018 - 23:54 Hierarchy: NounDescription: {{physics}} an onium where the bound antiparticle-particle pair is a pion and an antipion.Ngram: pioniumNgram Text: pioniumSource: WiktionaryIssue: 0Wiktionary tag: physicsNgram Count: 1
