Crossword Genius

Fundamental particle (4)

Ross

I believe the answer is:

atom

'fundamental particle' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for atom that I've seen before include "A small but mighty particle" , "Tiny bit" , "A really tiny piece of something" , "Piece of matter in moat" , "The tiniest particle" .)

I've seen this clue in The Times.
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