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n. A silvery-white, soft, rare-earth element occurring in monazite and bastnaesite and used to dope lasers and to absorb neutrons in research. Atomic number 63; atomic weight 151.96; melting point 826°C; boiling point 1,439°C; specific gravity 5.259; valence 2, 3. See Table at element.

n. a metallic chemical element (symbol Eu) with an atomic number of 63.

n. A metallic element of the rare-earth group (Lanthanide series), discovered spectroscopically by Demarcay in 1896. Symbol, Eu; atomic number 63; at. wt., 151.965 (C=12.011); valence = +2 or +3.

n. A supposed new element announced by Demarçay in 1901, obtained in very small quantity as oxid, sulphate, etc., from samar-skite and monazite.

n. a bivalent and trivalent metallic element of the rare earth group

"Now rare earth elements with exotic names such as europium and tantalum hold the key to hybrid cars, wind turbines and crystal-clear"

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