Definitions of nucleus:
- noun: a part of the cell containing DNA and RNA and responsible for growth and reproduction
- noun: any histologically identifiable mass of neural cell bodies in the brain or spinal cord
- noun: the positively charged dense of an atom
- noun: (astronomy) the 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
- noun: a small group of indispensable persons or things
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