uranium

u·ra·ni·um  (y-rn-m)

n. Symbol U

A heavy silvery-white metallic element, radioactive and toxic, easily oxidized, and having 14 known isotopes of which U 238 is the most abundant in nature. The element occurs in several minerals, including uraninite and carnotite, from which it is extracted and processed for use in research, nuclear fuels, and nuclear weapons. Atomic number 92; atomic weight 238.03; melting point 1,132°C; boiling point 3,818°C; specific gravity 18.95; valence 2, 3, 4, 5, 6. See Table at element.

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[New Latin ranium, after ranus, Uranus; see Uranus.]

Word History: Some chemical elements, such as ytterbium and berkelium, derive their names from the places they were discovered, but the element uranium owes its name to an earlier scientific discovery, that of the planet Uranus. Sir William Herschel, who discovered Uranus in 1781, wanted to name the planet Georgium sidus, "the Georgian planet," in honor of George III; others called it Herschel. Eventually convention prevailed and the planet came to be called Uranus, like Mercury and Pluto the name of a heavenly deity in classical mythology. This god, called Ouranos in Greek (Latinized as Uranus), was chosen because he was the father of Saturn (Greek Kronos), the deity of the planet next in line, who himself was the father of Jupiter (Greek Zeus), the deity of the next planet. The name of this new planet Uranus was then used in the name of a new chemical element discovered eight years later by M.H. Klaproth. Klaproth, a German scientist, gave it the Latin name uranium in honor of the discovery of Uranus. Uranium passed into English shortly thereafter, being first recorded in the third edition of the Encyclopedia Britannica, published in 1797.

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uranium [jʊˈreɪnɪəm]

n

(Chemistry / Elements & Compounds) a radioactive silvery-white metallic element of the actinide series. It occurs in several minerals including pitchblende, carnotite, and autunite and is used chiefly as a source of nuclear energy by fission of the radioisotope uranium-235. Symbol: U; atomic no.: 92; atomic wt.: 238.0289; half-life of most stable isotope, ²³⁸U:451 ✕ 10⁹ years; valency: 2-6; relative density: 18.95 (approx.); melting pt.: 1135°C; boiling pt.: 4134°C

[from New Latin, from Uranus²; from the fact that the element was discovered soon after the planet]

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uranium  (y-rn-m)

Symbol U

A heavy, silvery-white, highly toxic, radioactive metallic element of the actinide series. It has 14 known isotopes, of which U 238 is the most naturally abundant, occurring in several minerals. Fissionable isotopes, especially U 235, are used in nuclear reactors and nuclear weapons. Atomic number 92; atomic weight 238.03; melting point 1,132°C; boiling point 3,818°C; specific gravity 18.95; valence 2, 3, 4, 5, 6. See Periodic Table.

Thesaurus

Noun

1.

uranium - a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons atomic number 92, U metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. uranium 235 - a uranium isotope with mass number 235; capable of sustaining chain reactions uranium 238 - the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239 pitchblende, uraninite - a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore

Translations

uranium [jʊəˈreɪnɪəm] N → uranio m

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uranium [jʊˈreɪnɪəm]

n → uranium m

modif [mine, mining, ore, oxide, fuel, enrichment] → d'uranium

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uranium

n → Uran nt

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uranium [jʊəˈreɪnɪəm] n → uranio

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uranium [jʊəˈreɪnɪəm] n → uranio

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uranium

n uranium [juˈreiniəm]

a radioactive element. uraan يورانيوم уран uran uran das Uran ουράνιο uranio uraan اورانیم uraani uranium אוּרַניוּם यूरेनियम uran urán úraníum, úran uranio ウラニウム 우라늄 uranas urāns uranium uranium uran uran urânio uraniu уран urán uran uranijum uran ยูเรเนียม uranyum 鈾 уран يورينيم، ايک ريڈيائي عنصر urani 铀

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uranium → يورانيوم uran uran Uran ουράνιο uranio uraani uranium uran uranio ウラニウム 우라늄 uranium uran uran urânio уран uran ธาตุยูเรเนียม uranyum u-ra-nium 铀