| uranalysis | (noun) (medicine) the chemical analysis of urine (for medical diagnosis) | Synonyms: urinalysis |
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| uraninite | (noun) 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 | Synonyms: pitchblende |
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| uranium | (noun) a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons | Synonyms: atomic number 92, U |
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| uranologist | (noun) a physicist who studies astronomy | Synonyms: astronomer, stargazer |
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| uranology | (noun) the branch of physics that studies celestial bodies and the universe as a whole | Synonyms: astronomy |
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| uranoplasty | (noun) surgical correction of a defect of the palate | - |
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| uranyl | (noun) the bivalent radical UO2 which forms salts with acids | Synonyms: uranyl group, uranyl radical |
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