Enter a clue or pattern or both:

The Clue

Massless particle (6 letter answer)

The Answer

PHOTON

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Notes

The answer PHOTON is so rare that it appears less than once every 2900 puzzles.

Related Clues

Bit of illumination
Unit of light intensity

Definition

PHOTON as a noun:

1. a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle