Standard Lemma guide

muon

noun · 2 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

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • /ˈmjuːɒn/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • rhymes with -uːɒn

1

noun

Meaning 1

An unstable elementary particle in the lepton family, having similar properties to the electron but with a mass 207 times greater.

Definition source: English Wiktionary via Wiktextract

Topics: natural-sciences, physical-sciences, physics

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: negative muon, mu-meson

Antonyms: none provided

Broader terms: lepton

History

Etymology

Contraction of the earlier term mu-meson; the particle has now been recategorised as a lepton. Coined by Italian physicist Enrico Fermi in 1951 in his book Elementary Particles.

Across languages

Translations

35 source translations are retained for this English entry.

  • Armenian: մյուոն (myuon) — an unstable elementary particle in the lepton family
  • Basque: muoi — an unstable elementary particle in the lepton family
  • Bengali: মিউওন (miuōn) — an unstable elementary particle in the lepton family
  • Catalan: muó — an unstable elementary particle in the lepton family
  • Chinese Mandarin: μ子 (miùzǐ) — an unstable elementary particle in the lepton family
  • Chinese Mandarin: 緲子 /缈子 (miǎozǐ) — an unstable elementary particle in the lepton family
  • Chinese Mandarin: 渺子 (miǎozǐ) — an unstable elementary particle in the lepton family
  • Chinese Mandarin: 繆子 /缪子 (miùzǐ) — an unstable elementary particle in the lepton family
  • Dutch: muon — an unstable elementary particle in the lepton family
  • Esperanto: muono — an unstable elementary particle in the lepton family
  • Finnish: myoni — an unstable elementary particle in the lepton family
  • French: muon — an unstable elementary particle in the lepton family
  • Galician: muón — an unstable elementary particle in the lepton family
  • Georgian: მიუონი (miuoni) — an unstable elementary particle in the lepton family
  • German: Myon — an unstable elementary particle in the lepton family
  • Greek: μιόνιο (miónio) — an unstable elementary particle in the lepton family
  • Hungarian: müon — an unstable elementary particle in the lepton family
  • Icelandic: mýeind — an unstable elementary particle in the lepton family
  • Ido: muono — an unstable elementary particle in the lepton family
  • Italian: muone — an unstable elementary particle in the lepton family
  • Japanese: ミュー粒子 (myū ryūshi) — an unstable elementary particle in the lepton family
  • Khmer: មុយាណូ (muy yea no) — an unstable elementary particle in the lepton family
  • Korean: 뮤 입자 (myu ipja) — an unstable elementary particle in the lepton family
  • Norwegian: myon — an unstable elementary particle in the lepton family
  • Persian: میون — an unstable elementary particle in the lepton family
  • Persian: میوآن (myu-ân) — an unstable elementary particle in the lepton family
  • Polish: mion — an unstable elementary particle in the lepton family
  • Portuguese: muão — an unstable elementary particle in the lepton family
  • Portuguese: múon — an unstable elementary particle in the lepton family
  • Russian: мюо́н (mjuón) — an unstable elementary particle in the lepton family
  • Spanish: muon — an unstable elementary particle in the lepton family
  • Swedish: myon — an unstable elementary particle in the lepton family
  • Tagalog: mu tungapik — an unstable elementary particle in the lepton family
  • Thai: มิวออน — an unstable elementary particle in the lepton family
  • Vietnamese: muon — an unstable elementary particle in the lepton family