Cryptic crossword clue
Central matter for physicists luncheon: rocks releasing hydrogen 7

The most common and most likely answer to this crossword clue is the 7 letter word NUCLEON

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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
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What does NUCLEON mean?

NUCLEON noun
  1. One of the subatomic particles of the atomic nucleus, i.e. a proton or a neutron.

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