Crossword Genius

It's hardly any matter at all (4)

Ross

I believe the answer is:

atom

(Other definitions for atom that I've seen before include "A tiny particle of matter with a big bang" , "A mighty particle, can be explosive" , "Particle of matter now divided" , "It was once thought to be smallest particle of matter" , "The tiniest particle" .)

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