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Definition:(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) a small group of indispensable persons or things; "five periodicals make up the core of their publishing program" (noun) the positively charged dense center of an atom (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
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