noun
nucleus
The central or essential part of something.
A few dedicated volunteers form the nucleus of our team.
Etymology
A kernel is the central substance within an enclosing shell. Nucleus extends that image to the essential core around which a larger thing is organized.
More examples
- Her donated books provide the nucleus of the new library's collection.
- The weekly market remains the nucleus of village life.
- These neighborhood groups serve as nuclei for a wider movement.
Forms
nucleus · nuclei · nucleuses