Crossword Genius

Subject of study at CERN's laboratory (4)

Ross

I believe the answer is:

atom

(Other definitions for atom that I've seen before include "It was once thought to be smallest particle of matter" , "Bit of make-up" , "Smallest amount" , "A mighty physical particle or bomb" , "Smallest particle in an element able to take part in a chemical reaction" .)

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