nucleus

nucleus - English Dictionary

[ noun ]
■ the central structure of the lens that is surrounded by the cortex
→ lens nucleus

[ noun ]
■ a part of the cell containing DNA and RNA and responsible for growth and reproduction
→ 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
→ 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