/ˈnjukliəs / (say 'nyoohkleeuhs)

noun (plural nuclei /ˈnjukliaɪ/ (say 'nyoohkleeuy) or nucleuses)
1. a central part or thing about which other parts or things are grouped.
2. anything constituting a central part, foundation, or beginning: *There was a sufficient nucleus of population for the Administration to set up a police post. –olaf ruhen, 1958.
3. Biology a differentiated mass (usually rounded) of protoplasm, encased in a delicate membrane, present in the interior of nearly all living cells and forming an essential element in their growth metabolism and reproduction.
4. Anatomy a mass of grey matter in the brain and spinal cord in which incoming nerve fibres form connections with outgoing fibres.
5. Chemistry a fundamental arrangement of atoms, as the benzene ring, which may occur in many compounds by substitution of atoms without a change in structure.
6. Physics the central core of an atom, composed of protons and neutrons. It has a net positive charge equal to the combined charge of the protons.
7. Astronomy the more condensed portion of the head of a comet.
8. Meteorology a particle upon which condensation of water vapour occurs to form water drops.
9. Phonetics the central, vocalic constituent of a syllable, often a vowel, as the o sound in dog.
{Latin: nut, kernel, fruit stone}

Australian English dictionary. 2014.


Look at other dictionaries:

  • nucléus — [ nykleys ] n. m. • 1864; « nucelle » 1846; du lat. nucleus ♦ Préhist. Noyau de silex ou autre roche dure, dont on extrait des éclats, des lames. ● nucléus ou nucleus nom masculin invariable Petit fragment, d origine biologique ou détritique, qui …   Encyclopédie Universelle

  • Nucleus — may refer to: Nucleus (atomic structure), the very dense region at the center of an atom Cell nucleus, the control center of a cell, which contains the cell s chromosomal DNA Nucleus (neuroanatomy), a cluster of neurons in the central nervous… …   Wikipedia

  • Nucleus — Datos generales Nacimiento 1969 Origen Gran Bretaña Muerte 1989 Infor …   Wikipedia Español

  • Nucleus — OS Разработчик Mentor Graphics Семейство ОС Операционная система реального времени Поддерживаемые платформы ARM Тип ядра Реального времени Лицензия Проприетарная …   Википедия

  • Nucleus — (lat. „Kern“), selten Nukleus, steht für Atomkern, den massetragenden Teil im Zentrum eines Atoms Nucleus (ZNS), eine Ansammlung von Zellkörpern im Zentralnervensystem Silbenkern, eine Gruppe von Lauten im natürlichen Sprechfluss Zellkern, ein… …   Deutsch Wikipedia

  • Nucleus — Nu cle*us, n.; pl. E. {Nucleuses}, L. {Nuclei}. [L., a kernel, dim. fr. nux, nucis, nut. Cf. {Newel} post.] [1913 Webster] 1. A kernel; hence, a central mass or point about which matter is gathered, or to which accretion is made; the central or… …   The Collaborative International Dictionary of English

  • nucleus — (n.) 1704, kernel of a nut, 1708, head of a comet, from L. nucleus kernel, from nucula little nut, dim. of nux (gen. nucis) nut, from PIE *kneu nut (Cf. M.Ir. cnu, Welsh cneuen, M.Bret. knoen nut, O.N …   Etymology dictionary

  • nucleus — [no͞o′klē əs, nyo͞o′klē əs] n. pl. nuclei [no͞o′klēī΄, nyo͞o′klēī΄] or nucleuses [ModL < L, a nut, kernel, for nuculeus, dim. < nux (gen. nucis), NUT] 1. a thing or part forming the center around which other things or parts are grouped or… …   English World dictionary

  • nucleus — nucleus. См. мужской пронуклеус. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • nucleus — nucleus. См. ядро. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Nucleus — Nucleus. См. Ядро. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

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