Word.ws English Dictionary

positronium

/ˌpɒzɪˈtɹɒniəm/

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

Noun

positronium (plural positroniums or positronia)

  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.

Forms of positronium

pluralpositroniums
pluralpositronia

Origin of positronium

From positr(on) + -onium.

Words formed from positronium

Questions about positronium

What does positronium mean?
Positronium means an exotic atom (specifically, an onium) consisting of a positron (antielectron) and an electron, as a particle–anti-particle bound pair with no nucleus.
What part of speech is positronium?
Positronium is a noun.
How do you pronounce positronium?
Positronium is pronounced /ˌpɒzɪˈtɹɒniəm/ (US).
What is the plural of positronium?
The plural of positronium is positroniums.

Words near positronium in the dictionary

  1. positron emission tomographies
  2. positron emission tomography
  3. positron-emission tomography
  4. positronia
  5. positronic
  6. positronium
  7. positronium hydride
  8. positroniums
  9. positrons
  10. posits
  11. positura

Source and license

Adapted from Wiktionary: positronium (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Pronunciation audio from Wikimedia Commons, each file under its own free license: LL-Q1860 (eng)-Aadenboy-positronium.wav.

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