NUCLEUS

Nucleus usually refers to the center of something, but can mean:

In science:

• Atomic nucleus, the collection of protons and neutrons in the center of an atom that carries the bulk of the atom's mass and positive charge
• Cell nucleus, the membrane-bound subcellular organelle found in eukaryotes, visible via microscopy, which contains, primarily, the cell's chromosomes
• Nucleus (neuroanatomy), a central nervous system structure composed mainly of gray matter that mediates electrical signaling within a particular subsystem
• Comet nucleus, the solid core of a comet
• Galaxy nucleus, the central region of a galaxy
• Ice nucleus, the center of an ice crystal
• Cloud condensation nuclei, the basis for the development of a cloud droplet

In linguistics:

• syllable nucleus, the central part of a syllable
• sentence nucleus, the syllable which receives the greatest stress in a word

In computer science:

• Nucleus CMS, an open-source weblog system
• Nucleus RTOS, a brand of operating system

In music:

• Nucleus (band), a British jazz-rock band led by Ian Carr

Etymology

"Nucleus" is New Latin, the diminutive of the Latin nux (nut).

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