Nucleus ( : nuclei) is a Latin word for the seed inside a fruit. It most often refers to: *

Atomic nucleus The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment. After the discovery of the neutron ...

, the very dense central region of an atom * Cell nucleus, 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 ...

, the solid, central part of a comet

Biology

* Cell nucleus, a central organelle of a eukaryotic cell, containing most of the cell's DNA *

Nucleus (neuroanatomy) In neuroanatomy, a nucleus (plural form: nuclei) is a cluster of neurons in the central nervous system, located deep within the cerebral hemispheres and brainstem. The neurons in one nucleus usually have roughly similar connections and functions. N ...

, a cluster of cell bodies of neurons in the central nervous system *Nucleus that forms in the eye in nuclear sclerosis (early cataracts) *''Nucleus'', a scientific journal concerned with the cell nucleus; published by

Taylor & Francis Taylor & Francis Group is an international company originating in England that publishes books and academic journals. Its parts include Taylor & Francis, Routledge, F1000 (publisher), F1000 Research or Dovepress. It is a division of Informa ...

* 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 *

, the very dense central region of an atom * Condensation nucleus, the seed of a raindrop **

Ice nucleus An ice nucleus, also known as an ice nucleating particle (INP), is a particle which acts as the nucleus for the formation of an ice crystal in the atmosphere. Ice Nucleation Mechanisms There are a number of mechanisms of ice nucleation in the atmo ...

, 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

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