nucleus

US /ˈnuː.kli.əs/
UK /ˈnuː.kli.əs/
"nucleus" picture
1.

noyau, centre

the central and most important part of an object, movement, or group, forming the basis for its activity and growth

:
The family forms the nucleus of society.
La famille constitue le noyau de la société.
The city center is the nucleus of economic activity.
Le centre-ville est le noyau de l'activité économique.
2.

noyau

the central part of an atom, containing protons and neutrons

:
The atomic nucleus contains most of the atom's mass.
Le noyau atomique contient la majeure partie de la masse de l'atome.
Nuclear reactions occur within the nucleus.
Les réactions nucléaires se produisent à l'intérieur du noyau.
3.

noyau

a dense organelle present in most eukaryotic cells, typically a single rounded structure bounded by a double membrane, containing the genetic material

:
The cell's nucleus controls its growth and reproduction.
Le noyau de la cellule contrôle sa croissance et sa reproduction.
DNA is stored within the nucleus of the cell.
L'ADN est stocké à l'intérieur du noyau de la cellule.