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Nucleus ( : nuclei) is a Latin word for the seed inside a fruit. It most often refers to: * Atomic nucleus, the very dense central region of an atom *
Cell nucleus The cell nucleus (pl. nuclei; from Latin or , meaning ''kernel'' or ''seed'') is a membrane-bound organelle found in eukaryotic cells. Eukaryotic cells usually have a single nucleus, but a few cell types, such as mammalian red blood cells, h ...
, a central organelle of a eukaryotic cell, containing most of the cell's DNA Nucleus may also refer to:


Science, technology, and mathematics


Astronomy

*
Active galactic nucleus An active galactic nucleus (AGN) is a compact region at the center of a galaxy that has a much-higher-than-normal luminosity over at least some portion of the electromagnetic spectrum with characteristics indicating that the luminosity is not prod ...
in astronomy *
Comet nucleus The nucleus is the solid, central part of a comet, once termed a ''dirty snowball'' or an ''icy dirtball''. A cometary nucleus is composed of rock, dust, and frozen gases. When heated by the Sun, the gases sublime and produce an atmosphere su ...
, the solid, central part of a comet


Biology

*
Cell nucleus The cell nucleus (pl. nuclei; from Latin or , meaning ''kernel'' or ''seed'') is a membrane-bound organelle found in eukaryotic cells. Eukaryotic cells usually have a single nucleus, but a few cell types, such as mammalian red blood cells, h ...
, a central organelle of a eukaryotic cell, containing most of the cell's DNA * Nucleus (neuroanatomy), a cluster of cell bodies of neurons in the central nervous system *Nucleus that forms in the eye in
nuclear sclerosis Nuclear sclerosis is an age-related change in the density of the crystalline lens nucleus that occurs in all older animals. It is caused by compression of older lens fibers in the nucleus by new fiber formation. The denser construction of the nuc ...
(early cataracts) *''Nucleus'', a scientific journal concerned with the cell nucleus; published by Taylor & Francis * Nucleus, a small colony of honeybees, induced to raise a new queen by the beekeeper


Computer systems

* Nucleus (operating system), sometimes a synonym for kernel * Nucleus CMS, a weblog system *
Nucleus RTOS Nucleus RTOS is a real-time operating system (RTOS) produced by the Embedded Software Division of Mentor Graphics, a Siemens Business, supporting 32- and 64-bit embedded system platforms. The operating system (OS) is designed for real-time embedd ...
, a real-time operating system (RTOS) * Nucleus, part of an operating system loaded by an Initial Program Load or boot loader


Mathematics

* Nucleus (algebra), the elements of a ring that associate with all others * Nucleus (order theory), a mathematical term


Other sciences

* Nucleus (syllable), in linguistics, the central part of a syllable * Atomic nucleus, the very dense central region of an atom * Condensation nucleus, the seed of a raindrop ** Ice nucleus, the seed of a snowflake


Arts and media

* Nucleus (band), a jazz-rock band from Britain * ''Nucleus'' (video game), a 2007 downloadable game on the PlayStation Store * ''Nucleus'' (Anekdoten album), 1995 * ''Nucleus'' (Sonny Rollins album), 1975 * Nucleus, predecessor to Canadian rock band A Foot in Coldwater * ''Nucleus'', a scientific journal concerned with the cell nucleus; published by Taylor & Francis


Other uses

* Nucleus (advocacy group), a UK-European political advocacy campaign organisation * Nucleus Limited, an Australian medical research company, taken over by Pacific Dunlop in 1988 * NuCLEus, a proposed 54-story mixed use building in Cleveland, Ohio, US * Nucleus, the Nuclear and Caithness Archives, a British national archive


See also

* Nuclear (disambiguation) * Nucleation * Nucleic acid * Nucleolus *
Core (disambiguation) Core or cores may refer to: Science and technology * Core (anatomy), everything except the appendages * Core (manufacturing), used in casting and molding * Core (optical fiber), the signal-carrying portion of an optical fiber * Core, the central ...
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