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nouna part of the cell containing DNA and RNA and responsible for growth and reproduction
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nouna small group of indispensable persons or things
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nounthe central structure of the lens that is surrounded by the cortex
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nounany histologically identifiable mass of neural cell bodies in the brain or spinal cordtype of:
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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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nounthe positively charged dense center of an atom