- In chemistry and physics, the
nucleus (atomic nucleus) is the collection of protons and neutrons in the center of an atom that carries the bulk
of the atom's mass and positive charge.
- In cell biology, the nucleus (cell nuclus) is the membrane-bound
subcellular organelle found in eukaryotes, visible via microscopy, which contains, primarily,
the cell's chromosomes.
- In neuroanatomy, a nucleus is a central nervous system structure that is composed mainly of gray matter and mediates electrical signaling within a particular subsystem.
- In comets, a nucleus (comet nucleus) is the solid core of a comet.
- In astronomy, a nucleus (galaxy nucleus) is the central
region of a galaxy.
- In meteorology, a nucleus (ice nucleus) is the center of an
ice crystal.
- In meteorology, a nucleus (cloud condensation nuclei) is the basis for the development of a cloud droplet.
- In linguistics, the nucleus is
the center part of a syllable, most often a vowel.
Etymology
"Nucleus" comes from the Latin for center or core.
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