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noun (plural nuclei /-klēˌī/)
the central and most important part of an object, movement, or group, forming the basis for its activity and growth:the nucleus of a film-producing industry Physics the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass. Biology a dense organelle present in most eukaryotic cells, typically a single rounded structure bounded by a double membrane, containing the genetic material. Astronomy the solid part of the head of a comet. Anatomy a discrete mass of gray matter in the central nervous system.
Make the plural by changing the -us
ending to -i
(as in Latin): (nuclei)