Enter a clue or pattern or both:
The Clue
Some subatomic particles (5 letter answer)
The Answer
PIONS
Tags
Notes
The answer PIONS is so rare that it appears less than once every 2500 puzzles.
Related Clues
Subatomic particles
No-spin particles
Definition
PION as a noun:
1. (pion, pi-meson) = a meson involved in holding the nucleus together; produced as the result of high-energy particle collision