nucleus
n//ˈnjuː.kli.əs//kärna, atomkärna, cellkärna
The core, central part of something, around which other elements are assembled.
(phonetics, phonology) The central part of a syllable, most commonly a vowel.
(chemistry, physics) The massive, positively charged central part of an atom, made up of protons and neutrons.
(cytology) A large membrane-enclosed organelle found in eukaryotic cells which contains genetic material.