Definition - nucleus

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  1. the central structure of the lens that is surrounded by the cortex
  2. a part of the cell containing DNA and RNA and responsible for growth and reproduction
  3. any histologically identifiable mass of neural cell bodies in the brain or spinal cord
  4. a small group of indispensable persons or things; "five periodicals make up the core of their publishing program"
  5. the positively charged dense center of an atom
  6. (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