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 at the Department_of_Physics_and_Astronomy,_University_of_Manchester , University of Manchester ...

, the very dense central region of an atom *

Cell nucleus The cell nucleus (; : nuclei) is a membrane-bound organelle found in eukaryote, eukaryotic cell (biology), cells. Eukaryotic cells usually have a single nucleus, but a few cell types, such as mammalian red blood cells, have #Anucleated_cells, ...

, 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 emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars. Such e ...

in astronomy *

Comet nucleus The nucleus is the solid, central part of a comet, formerly 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 atmosphe ...

, the solid, central part of a comet

Biology

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

Nucleus (neuroanatomy) In neuroanatomy, a nucleus (: 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. Nuclei are c ...

, 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 the United Kingdom that publishes books and academic journals. Its parts include Taylor & Francis, CRC Press, Routledge, F1000 (publisher), F1000 Research and Dovepress. It i ...

Nucleus 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, a central organelle of a eukaryotic cell, containing most of the cell's DNA Nucleu ...

, 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-bit computing, 32- and 64-bit computing, 64-bit embedded system platforms. The operating system (O ...

, a real-time operating system (RTOS) * Nucleus, part of an operating system loaded by an

Initial Program Load In computing, booting is the process of starting a computer as initiated via hardware such as a physical button on the computer or by a software command. After it is switched on, a computer's central processing unit (CPU) has no software in ...

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) A syllable is a basic unit of organization within a sequence of speech sounds, such as within a word, typically defined by linguists as a ''nucleus'' (most often a vowel) with optional sounds before or after that nucleus (''margins'', which are ...

, 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 a ...

, 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'' (Deeds of Flesh album), 2020 * ''Nucleus'' (Sonny Rollins album), 1975 * Nucleus, predecessor to Canadian rock band

A Foot in Coldwater A, or a, is the first letter and the first vowel letter of the Latin alphabet, used in the modern English alphabet, and others worldwide. Its name in English is '' a'' (pronounced ), plural ''aes''. It is similar in shape to the Ancient ...

* ''Nucleus'', a scientific journal concerned with the cell nucleus; published by

Other uses

Nucleus (advocacy group) Nucleus was a British-European advocacy group, the forerunner to '' British Influence'' (sometimes ''The Centre for British Influence''). Nucleus was based in London, with additional operations in Brussels. Founded in 2010, Nucleus promoted a 'e ...

, a UK-European political advocacy campaign organisation *

Nucleus Limited Nucleus Limited began as a private company in Sydney, Australia, in 1965. It was founded by former Watson-Victor executive Paul Murray Trainor, after acquisition of X-ray sales & service company Scientific & General. Other companies to be controll ...

, an Australian medical research company, taken over by Pacific Dunlop in 1988 *

nuCLEus 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, a central organelle of a eukaryotic cell, containing most of the cell's DNA Nucleu ...

, a proposed 54-story mixed use building in Cleveland, Ohio, US * Nucleus, the Nuclear and Caithness Archives, a British national archive