Onium

An onium (plural: onia) is a bound state of a particle and its antiparticle. These states are usually named by adding the suffix -onium to the name of one of the constituent particles (replacing an -on suffix when present), with one exception for "muonium"; a muon–antimuon bound pair is called "true muonium" to avoid confusion with old nomenclature.

Not to be confused with onium ions such as ammonium.
Antimatter
Antiparticles

Onia
Concepts and phenomena
Devices
Uses
People and bodies
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