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The Clue

Physics particle (8 letter answer)

The Answer

POSITRON

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Notes

The answer POSITRON is so rare that it appears less than once every 2500 puzzles.

Related Clues

Beta decay emission, sometimes

Definition

POSITRON as a noun:

1. (positron, antielectron) = an elementary particle with positive charge; interaction of a positron and an electron results in annihilation