Crossword Genius

Atomic cores (6)

Ross

I believe the answer is:

nuclei

'atomic cores' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for nuclei that I've seen before include "Cores of atoms" , "Atom cores" , "Atomic cores" , "Central parts of atoms" , "Central pieces" .)

I've seen this clue in The Telegraph, The Times, the LA Times and the Newsday.com.
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