Borrowed from Latin nucleus (“kernel, core”), a diminutive of nux (“nut”). The earliest uses refer to the head of a comet and the kernel of a seed, both recorded in Lexicon Technicum in 1704. The sense in atomic physics was coined by English scientist Michael Faraday in 1844 in a theoretical meaning.
- (Received Pronunciation) IPA(key): /ˈnjuː.kli.əs/
- (General American) IPA(key): /ˈnuːkli.əs/
Audio (US) (file)
- The core, central part of something, around which other elements are assembled.
- An initial part or version that will receive additions.
- This collection will form the nucleus of a new library.
- (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.
- (neuroanatomy) A ganglion, cluster of many neuronal bodies where synapsing occurs.
- (phonetics, phonology) The central part of a syllable, most commonly a vowel.
- nucleate, anucleate
- nucleic acid
- nucleus cowry, nucleus cowrie (Nucleolaria nucleus)
- atomic nucleus
- cell nucleus
- planetary nebula nucleus
- syllable nucleus, the central part of a syllable
- sentence nucleus, the syllable which receives the greatest stress in a word
- The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.
A diminutive of nux (“nut”), with an irregular change of gender from feminine to masculine.
- (Classical) IPA(key): /ˈnu.kle.us/, [ˈnʊkɫ̪eʊs̠] or IPA(key): /ˈnuk.le.us/, [ˈnʊkɫ̪eʊs̠]
- (Ecclesiastical) IPA(key): /ˈnu.kle.us/, [ˈnuːkleus] or IPA(key): /ˈnuk.le.us/, [ˈnukleus]