| Front | nucleus |ˈnjuːklɪəs| |
|---|---|
| Back | noun 1 the central and most important part of an object, movement, or group, forming the basis for its activity and growth: 2 Physics the positively charged central core of an atom that contains most of its mass. 3 Biology a dense organelle present in most eukaryotic cells, typically a single rounded structure bounded by a double membrane, containing the genetic material. 4 a discrete mass of grey matter in the central nervous system. 5 Astronomy the solid part of a comet's head. |
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