Definitions
1.nounThe core, central part of something, around which other elements are assembled.
2.nounAn initial part or version that will receive additions."This collection will form the nucleus of a new library."
3.nounThe massive, positively charged central part of an atom, made up of protons and neutrons.
4.nounA large membrane-enclosed organelle found in eukaryotic cells which contains genetic material.
5.nounA ganglion, cluster of many neuronal bodies where synapsing occurs.
6.nounThe central part of a syllable, most commonly a vowel.