Enter a clue or pattern or both:
The Clue
Fundamental physics particle (5 letter answer)
The Answer
MESON
Tags
Notes
The answer MESON is uncommon, appearing about once every 550 puzzles.
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Definition
MESON as a noun:
1. (meson, mesotron) = an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0