nucleus

noun7

1. •
   The core, central part of something, around which other elements are assembled.
2. •
   The massive, positively charged central part of an atom, made up of protons and neutrons.
3. •
   A large membrane-enclosed organelle found in eukaryotic cells which contains genetic material.
4. •
   The central part of a syllable, most commonly a vowel.
5. •
   An initial part or version that will receive additions.

   • This collection will form the nucleus of a new library.
6. •
   A small bee-hive used to create a colony from a larger existing one.
7. •
   A ganglion, cluster of many neuronal bodies where synapsing occurs.