Crossword Genius

It's so thin you can't see it! (3)

Ross

I believe the answer is:

air

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But I can't explain it at all! Could you help me understand?

(Other definitions for air that I've seen before include "Tune (on the G string?)" , "Light wind; song" , "Ventilate with oxygen" , "If it's hot, it's boastful" , "distinctive quality" .)

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