nucleus

Sense 1 noun

a part of the cell containing DNA and RNA and responsible for growth and reproduction

Sense 2 noun

the positively charged dense center of an atom

Sense 3 noun

a small group of indispensable persons or things

five periodicals make up the core of their publishing program

Sense 4 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

Sense 5 noun

any histologically identifiable mass of neural cell bodies in the brain or spinal cord

Sense 6 noun

the central structure of the lens that is surrounded by the cortex