1. (noun) nucleus, cell nucleus, karyon
a part of the cell containing DNA and RNA and responsible for growth and reproduction
Synonyms: core group, lens nucleus, core, karyon, cell nucleus, nucleus
2. (noun) nucleus
the positively charged dense center of an atom
Synonyms: core group, lens nucleus, core, karyon, cell nucleus
3. (noun) core, nucleus, core group
a small group of indispensable persons or things
Synonyms: nitty-gritty, meat, nucleus, core group, sum, inwardness, gist, heart and soul, lens nucleus, effect, substance, nub, center, burden, centre, kernel, magnetic core, essence, core, heart, karyon, marrow, pith, cell nucleus
4. (noun) nucleus
(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
Synonyms: core group, lens nucleus, core, karyon, cell nucleus
5. (noun) nucleus
any histologically identifiable mass of neural cell bodies in the brain or spinal cord
Synonyms: core group, lens nucleus, core, karyon, cell nucleus
6. (noun) lens nucleus, nucleus
the central structure of the lens that is surrounded by the cortex
Synonyms: lens nucleus, core, core group, karyon, cell nucleus, nucleus
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Synonyms for nucleus 
