noun Usage: often attributive Etymology: New Latin, from Uranus Date: circa 1797 a silvery heavy radioactive polyvalent metallic element that is found especially in uraninite and exists naturally as a mixture of mostly nonfissionable isotopes — see element table

New Collegiate Dictionary. 2001.

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  • Uranium — (pronEng|jʊˈreɪniəm) is a silvery gray metallic chemical element in the actinide series of the periodic table that has the symbol U and atomic number 92. It has 92 protons and 92 electrons, 6 of them valence electrons. It can have between 141 and …   Wikipedia

  • Uranium — Protactinium ← Uranium → Neptunium Nd …   Wikipédia en Français

  • URANIUM — L’uranium (symbole U, numéro atomique 92) est un élément chimique métallique très dense (d = 19), dur, dont la couleur grise rappelle celle du nickel. Pendant les cent cinquante ans qui suivirent sa découverte, en 1789, par Martin Heinrich… …   Encyclopédie Universelle

  • uranium — [yoo rā′nē əm] n. [ModL: so named (1789) by M. H. Klaproth (see TELLURIUM), its discoverer, after URANUS, recently (1781) discovered planet + IUM] a very hard, heavy, silver colored, radioactive, metallic chemical element, one of the actinides,… …   English World dictionary

  • Uranium — U*ra ni*um, n. [NL., from Uranus the planet. See {Uranus}.] (Chem.) An element of the chromium group, found in certain rare minerals, as pitchblende, uranite, etc., and reduced as a heavy, hard, nickel white metal which is quite permanent. Its… …   The Collaborative International Dictionary of English

  • uranium — Symbol: U Atomic number: 92 Atomic weight: (231) White radioactive metallic element belonging to the actinoids. Three natural isotopes, U 238, U 235 and U 234. Uranium 235 is used as the fuel for nuclear reactors and weapons. Discovered by Martin …   Elements of periodic system

  • Uranium — Uranium, so v.w. Uranorama …   Pierer's Universal-Lexikon

  • Uranium — (U) Уран химический радиоактивный элемент (металл) с атомным номером 92 и атомной массой наиболее распространенного и устойчивого изотопа 238. Природный уран состоит из смеси трех изотопов урана 238, урана 235 и урана 234, из которых практическое …   Термины атомной энергетики

  • uranium — rare metallic element, 1797, named 1789 in Modern Latin by its discoverer, German chemist and mineralogist Martin Heinrich Klaproth (1743 1817), for the recently found planet URANUS (Cf. Uranus) (q.v.) …   Etymology dictionary

  • uranium — ► NOUN ▪ a grey dense radioactive metallic chemical element used as a fuel in nuclear reactors. ORIGIN from the planet Uranus …   English terms dictionary

  • uranium — /yoo ray nee euhm/, n. Chem. a white, lustrous, radioactive, metallic element, occurring in pitchblende, and having compounds that are used in photography and in coloring glass. The 235 isotope is used in atomic and hydrogen bombs and as a fuel… …   Universalium

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