1. nucleus, cell nucleus, karyon -- (a part of the cell containing DNA and RNA and responsible for growth and reproduction).
2. nucleus -- (the positively charged dense center of an atom).
3. core, nucleus, core group -- (a small group of indispensable persons or things; "five periodicals make up the core of their publishing program").
4. nucleus -- ((astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail).
5. nucleus -- (any histologically identifiable mass of neural cell bodies in the brain or spinal cord).
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