English definition of Uranium

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Definition of uranium

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Uranium (n.) 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 yellow oxide is used to impart to glass a delicate greenish-yellow tint which is accompanied by a strong fluorescence, and its black oxide is used as a pigment in porcelain painting. Symbol U. Atomic weight 239..

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Uran-ochre :: Uran-ochre (n.) A yellow, earthy incrustation, consisting essentially of the oxide of uranium, but more or less impure..

Uranium :: Uranium (n.) 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 yellow oxide is used to impart to glass a delicate greenish-yellow tint which is accompanied by a strong fluorescence, and its black oxide is used as a pigment in porcelain painting. Symbol U. Atomic weight 239..

Uranic :: Uranic (a.) Pertaining to, resembling, or containing uranium; specifically, designating those compounds in which uranium has a valence relatively higher than in uranous compounds..

Uraninite :: Uraninite (n.) A mineral consisting chiefly of uranium oxide with some lead, thorium, etc., occurring in black octahedrons, also in masses with a pitchlike luster; pitchblende..

Semimetal :: Semimetal (n.) An element possessing metallic properties in an inferior degree and not malleable, as arsenic, antimony, bismuth, molybdenum, uranium, etc..

Uranous :: Uranous (a.) Pertaining to, or containing, uranium; designating those compounds in which uranium has a lower valence as contrasted with the uranic compounds..

Torbernite :: Torbernite (n.) A mineral occurring in emerald-green tabular crystals having a micaceous structure. It is a hydrous phosphate of uranium and copper. Called also copper uranite, and chalcolite..

Uranite :: Uranite (n.) A general term for the uranium phosphates, autunite, or lime uranite, and torbernite, or copper uranite..

Yttro-tantalite :: Yttro-tantalite (n.) A tantalate of uranium, yttrium, and calcium, of a brown or black color..

Gummite :: Gummite (n.) A yellow amorphous mineral, essentially a hydrated oxide of uranium derived from the alteration of uraninite..

Uranin :: Uranin (n.) An alkaline salt of fluorescein, obtained as a brownish red substance, which is used as a dye; -- so called from the peculiar yellowish green fluorescence (resembling that of uranium glass) of its solutions. See Fluorescein..

Pitchblende :: Pitchblende (n.) A pitch-black mineral consisting chiefly of the oxide of uranium; uraninite. See Uraninite.

Uranitic :: Uranitic (a.) Of or pertaining to uranium; containing uranium.

Uranoso- :: Uranoso- (a.) A combining form (also used adjectively) from uranium; -- used in naming certain complex compounds; as in uranoso-uranic oxide, uranoso-uranic sulphate..

Euxenite :: Euxenite (n.) A brownish black mineral with a metallic luster, found in Norway. It contains niobium, titanium, yttrium, and uranium, with some other metals..

Uranyl :: Uranyl (n.) The radical UO2, conveniently regarded as a residue of many uranium compounds..

Samarskite :: Samarskite (a.) A rare mineral having a velvet-black color and submetallic luster. It is a niobate of uranium, iron, and the yttrium and cerium metals..