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