Etymology
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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.).

updated on November 29, 2017

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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, not affiliated with etymonline.