The clue "Speed-of-light particle" last appeared in the USA Today crossword on March 27, 2018. The correct answer for this puzzle is "PHOTON", a 6-letter word.
Solution PHOTON is 6 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is PHOTON with 6 letters, and the shortest is PHOTON with 6 letters.
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The solution is 6 letters long.