Standard Lemma guide

positronium

noun · 1 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • General-American: /ˌpɒzɪˈtɹɒniəm/
  • General-American: /ˌpɒzɪˈtɹoʊniəm/
  • US: Recorded audio is listed in the source snapshot.

1

noun

Meaning 1

An exotic atom (specifically, an onium) consisting of a positron (antielectron) and an electron, as a particle–anti-particle bound pair with no nucleus.

Definition source: English Wiktionary via Wiktextract

Topics: chemistry, natural-sciences, physical-sciences, physics

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

From positr(on) + -onium.

Across languages

Translations

8 source translations are retained for this English entry.

  • Chinese Mandarin: 電子偶素 /电子偶素 (diànzǐ'ǒusù) — exotic atom
  • Chinese Mandarin: 正電子素 /正电子素 (zhèngdiànzǐsù) — exotic atom
  • German: Positronium — exotic atom
  • Hungarian: pozitrónium — exotic atom
  • Ido: positronio — exotic atom
  • Italian: positronio — exotic atom
  • Russian: позитроний (pozitronij) — exotic atom
  • Spanish: positronio — exotic atom