nucleus


nucleus
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 collected; core
2. anything serving as a center of growth or development [the nucleus of a library]
3. Anat. a group of nerve cells in the brain or spinal column
4. Astron. the bright central part of the head of a comet
5. Biol. the central, usually spherical or oval mass of protoplasm present in most plant and animal cells, containing most of the hereditary material and necessary to such functions as growth, reproduction, etc.: see CELL
6. Bot. the central point in a starch grain
7. Chem. Physics the central part of an atom, the fundamental particles of which are the proton and neutron, except for hydrogen, which is usually composed of one proton only: it carries a positive charge and constitutes almost all of the mass of the atom
8. Phonet. the most sonorous portion of a syllable, usually a vowel
9. Organic Chem. a fundamental, stable arrangement of atoms that may occur in many compounds by atomic substitution without structural change, as the benzene ring

English World dictionary. . 2014.

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  • 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 — 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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