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lens nucleus, nucleus | the central structure of the lens that is surrounded by the cortex | |
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nucleus | [in 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 | |
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nucleus | the positively charged dense center of an atom | |
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nucleus | any histologically identifiable mass of neural cell bodies in the brain or spinal cord | |
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core, nucleus, core group | a small group of indispensable persons or things | |
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nucleus, cell nucleus, karyon | a part of the cell containing DNA and RNA and responsible for growth and reproduction |