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uranium (n.)

rare metallic element, 1797, named 1789 in Modern Latin by its discoverer, German chemist and mineralogist Martin Heinrich Klaproth, for the recently found planet Uranus (q.v.).

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Definitions of uranium from WordNet

uranium (n.)
a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons;
Synonyms: u / atomic number "
From wordnet.princeton.edu