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europium (n.)

rare earth element, 1901, named by its discoverer, French chemist Eugène Demarçay (1852-1903) in 1896, from Europe. With metallic element ending -ium.

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Definitions of europium from WordNet

europium (n.)
a bivalent and trivalent metallic element of the rare earth group;
Synonyms: Eu / atomic number "
From wordnet.princeton.edu