Crossword Genius

Small building block (4)

Ross

I believe the answer is:

atom

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small building block</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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 New York Times and the LA Times.
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