A nucleus is often called the brain, or control center, of a eukaryotic cell (that is, a cell with a nucleus).
The noun nucleus has several senses, though most of them will appear in science. If a biology teacher says nucleus, she is probably talking about a cell (or a group of cells), but a physics teacher would be talking about the center of an atom, or possibly even the center of a comet’s head. Step out of science class, and nucleus likely refers to a core group — like the math fanatics that math club could not function without.
Definitions of nucleus
a part of the cell containing DNA and RNA and responsible for growth and reproduction
a point equidistant from the ends of a line or the extremities of a figure
DISCLAIMER: These example sentences appear in various news sources and books to reflect the usage of the word ‘nucleus'.
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