Positive or negative particle (3)

I believe the answer is:

ion

'positive or negative particle' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ion that I've seen before include "Subatomic particle" , "Particle (phys.)" , "Electrically-charged particle" , "Electrically charged particle" , "Charged atom/molecule" .)

I've seen this clue in the Wall Street Journal, The Washington Post, The New York Times, the Universal and the USA Today.

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