positronium.
An exotic atom (specifically, an onium) consisting of a positron (antielectron) and an electron, as a particle–anti-particle bound pair with no nucleus.
Meaning & usage
An exotic atom (specifically, an onium) consisting of a positron (antielectron) and an electron, as a particle–anti-particle bound pair with no nucleus.
Where this word comes from
From positr(on) + -onium.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.