Words · Less common
muon
4 letters · 4 distinct letters
- noun
an elementary particle with a negative charge and a half life of 2 microsecond; decays to electron and neutrino and antineutrino
Word history
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.
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Why this word counts
- Where it comes from
- Listed in the English Speller Database at size 70: the largest list we accept, where the rarer words live.
- How common it is
- Used about once in every 4 million words.
- In the spelling bee
- Bonus word Words found only in the largest list score as bonus words rather than daily answers.