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    nucleus - Dictionary definition and meaning for word nucleus

    (noun) a part of the cell containing DNA and RNA and responsible for growth and reproduction
    Synonyms : cell nucleus , karyon
    (noun) the positively charged dense center of an atom Definition
    (noun) a small group of indispensable persons or things
    Synonyms : core , core group
    Example Sentence
    • five periodicals make up the core of their publishing program
    (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 Definition
    (noun) any histologically identifiable mass of neural cell bodies in the brain or spinal cord Definition
    (noun) the central structure of the lens that is surrounded by the cortex
    Synonyms : lens nucleus
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