from The American Heritage® Dictionary of the English Language, 4th Edition
- 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a metallic chemical element (symbol Eu) with an atomic number of 63.
from the GNU version of the Collaborative International Dictionary of English
- 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.
from The Century Dictionary and Cyclopedia
- n. A supposed new element announced by Demarçay in 1901, obtained in very small quantity as oxid, sulphate, etc., from samar-skite and monazite.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a bivalent and trivalent metallic element of the rare earth group
After Europe .(American Heritage® Dictionary of the English Language, Fourth Edition)
After the continent of Europe + -ium. (Wiktionary)