Crossword Genius

Small building block (4)

Ross

I believe the answer is:

atom

'small building block' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for atom that I've seen before include "Tiny bit" , "Something very small perhaps" , "Nucleus plus electrons" , "A really tiny piece of something" , "Minute particle" .)

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