| uracil | (noun) a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine | Synonyms: U |
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| uraemia | (noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine | Synonyms: azotaemia, azotemia, uremia |
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| 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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| urarthritis | (noun) a painful inflammation of the big toe and foot caused by defects in uric acid metabolism resulting in deposits of the acid and its salts in the blood and joints | Synonyms: gout, gouty arthritis |
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| urate | (noun) a salt of uric acid | - |
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| uratemia | (noun) presence of abnormal amounts of uric acid salts in the blood; symptom of gout | - |
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| uraturia | (noun) presence of abnormally large amounts of uric acid in the urine; symptom of gout | - |
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