nucleus

• a part of the cell containing DNA and RNA and responsible for growth and reproduction
• a small group of indispensable persons or things
• the central structure of the lens that is surrounded by the cortex
• the positively charged dense center of an atom
• (astronomy) the center of the head of a comet
• any histologically identifiable mass of neural cell bodies in the brain or spinal cord
• A kernel
• The body or the head of a comet
• An incipient ovule of soft cellular tissue
• A whole seed, as contained within the seed coats
• A body, usually spheroidal, in a cell or a protozoan, distinguished from the surrounding protoplasm by a difference in refrangibility and in behavior towards chemical reagents. It is more or less protoplasmic, and consists of a clear fluid (achromatin) through which extends a network of fibers (chromatin) in which may be suspended a second rounded body, the nucleolus (see Nucleoplasm)
• The tip, or earliest part, of a univalve or bivalve shell
• The central part around which additional growths are added, as of an operculum
• A visceral mass, containing the stomach and other organs, in Tunicata and some mollusks

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