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Subatomic particle

Ross

'subatomic particle' is the definition.
(pion is a kind of subatomic particle)

This is all the clue.

(Other definitions for pion that I've seen before include "It carries strong force" , "Subatomic particle" , "something tiny" , "Type of meson" .)

I've seen this clue in The Times, the LA Times, The New York Times and the Newsday.
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