NUCLEUS

(noun) the central structure of the lens that is surrounded by the cortex
synonyms : lens nucleus
(noun) a part of the cell containing DNA and RNA and responsible for growth and reproduction
synonyms : cell nucleus , karyon
(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"
synonyms : core , core group
(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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