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  1. [noun] a part of the cell containing DNA and RNA and responsible for growth and reproduction
    Synonyms: cell karyon

  2. [noun] the positively charged dense center of an atom

  3. [noun] a small group of indispensable persons or things; "five periodicals make up the core of their publishing program"
    Synonyms: core, core group

  4. [noun] (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. [noun] any histologically identifiable mass of neural cell bodies in the brain or spinal cord


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