Definitions from Wiktionary, a free dictionary

Contents 1 English 1.1 Etymology 1.2 Pronunciation 1.3 Noun 1.3.1 Derived terms 1.3.2 Translations 1.4 See also 2 Latin 2.1 Etymology 2.2 Noun

[ English

Wikipedia

[ Etymology

From Latin nucleus (“‘kernel’”) derived from nux (“‘nut’”).

[ Pronunciation

• (RP) IPA: /ˈnjuː.kli.əs/, SAMPA: /"nju:.kli.@s/
• (GenAm) IPA: /ˈnuːkliəs/, SAMPA: /"nu:kli@s/
•  Audio (US)^{help, file}

[ Noun

Singular nucleus

Plural nuclei or nucleuses

nucleus (plural nuclei or nucleuses)

1. (chemistry, physics) The massive, positively charged central part of an atom made up of protons and neutrons.
2. (cytology) A large organelle found in cells which contains genetic material.
3. The central part (of something), round which others are collected.
4. An initial part that will receive additions.

   This collection will form the nucleus of a new library.

5. (neuroanatomy) A cluster of many neuronal bodies where synapsing occurs.

[ Derived terms

nuclear nuclease nucleate nucleic acid

nucleon anucleate atomic nucleus cell nucleus

[ Translations

physics: massive, positively charged core of an atom

Czech: jádro cs(cs) n. Finnish: ydin fi(fi) German: Atomkern de(de) m. Greek: πυρήνας el(el) (pyrínas) m.

Japanese: 原子核 ja(ja) (げんしかく, genshikaku) Polish: jądro pl(pl) n. Russian: ядро ru(ru) (jadró) n. Spanish: núcleo es(es) m.

cytology: large organelle found in cells

Czech: jádro cs(cs) n. Finnish: tuma fi(fi) German: Zellkern de(de) m. Greek: πυρήνας el(el) (pyrínas) m.

Russian: ядро ru(ru) (jadró) n. Spanish: núcleo es(es) m.

central part of something

Finnish: ydin fi(fi) Greek: πυρήνας el(el) (pyrínas) m.

Japanese: 核 ja(ja) (かく, kaku) Polish: jądro pl(pl) n. Russian: ядро ru(ru) (jadró) n., центр ru(ru) (centr) m. Spanish: núcleo es(es) m.

initial part which will receive additions

Finnish: ydin fi(fi)

Russian: ядро ru(ru) (jadró) n.

neuroanatomy: cluster of many neuronal bodies

Russian: ядро ru(ru) (jadró) n.

[ See also

• Atomic nucleus on Wikipedia.Wikipedia:Atomic nucleus
• Cell nucleus on Wikipedia.Wikipedia:Cell nucleus
• Comet on Wikipedia.Wikipedia:Comet
• Nucleus (neuroanatomy) on Wikipedia.Wikipedia:Nucleus (neuroanatomy)
• Nucleus (linguistics) on Wikipedia.Wikipedia:Nucleus (linguistics)

---

[ Latin

[ Etymology

From nux (“‘nut’”).

[ Noun

nucleus (genitive nuclei); m, second declension

1. kernel