NUCLEUS

Definition

1. noun a part of the cell containing DNA and RNA and responsible for growth and reproduction. — synonyms: cell_nucleus, karyon
2. noun the positively charged dense center of an atom.
3. noun a small group of indispensable persons or things. — synonyms: core, core_group
4. noun (astronomy) the center of the head of a comet.
5. noun any histologically identifiable mass of neural cell bodies in the brain or spinal cord.
6. noun the central structure of the lens that is surrounded by the cortex. — synonyms: lens_nucleus