Crossword Genius

Plus-or-minus one? (3)

Ross

I believe the answer is:

ion

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

I've seen this clue in The New York Times.
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