1. • noun - a part of the cell containing DNA and RNA and responsible for growth and reproduction
   • noun - the positively charged dense center of an atom
   • noun - a small group of indispensable persons or things
   • noun - (astronomy) the center of the head of a comet
   • noun - any histologically identifiable mass of neural cell bodies in the brain or spinal cord
   • noun - the central structure of the lens that is surrounded by the cortex
2. • A central or essential part around which other parts are gathered or grouped; a core: the nucleus of a city.
   • Something regarded as a basis for future development and growth; a kernel: a few paintings that formed the nucleus of a great art collection.
   • A large, membrane-bound, usually spherical protoplasmic structure within a living cell, containing the cell’s hereditary material and controlling its metabolism, growth, and reproduction.
   • Botany.
   • The central kernel of a nut or seed.
   • The center of a starch granule.
   • A group of specialized nerve cells or a localized mass of gray matter in the brain or spinal cord.
   • The positively charged central region of an atom, composed of protons and neutrons and containing almost all of the mass of the atom.
   • A group of atoms bound in a structure, such as a benzene ring, that is resistant to alteration in chemical reactions.
   • Astronomy.
   • The central portion of the head of a comet.
   • The central or brightest part of a nebula or galaxy.
   • A particle on which water vapor molecules accumulate in free air to form a droplet or ice crystal.
3. • n - an essential part of a cell

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