from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A silvery-white rare-earth element that is exceptionally difficult to separate from the other rare-earth elements, used in nuclear technology. Atomic number 71; atomic weight 174.97; melting point 1,663°C; boiling point 3,395°C; specific gravity 9.840 (at 25°C); valence 3. See Table at element.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A metallic chemical element (symbol Lu) with an atomic number of 71.
from the GNU version of the Collaborative International Dictionary of English
- n. A metallic element separated from ytterbium in 1907, by Urbain in Paris and by von Welsbach in Vienna. It is a member of the Lanthanide rare earth group. Symbol, Lu; atomic number 71; atomic weight 174.967 [C=12.011]. Previously spelled Lutecium.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a trivalent metallic element of the rare earth group; usually occurs in association with yttrium
Latin Lutetia, ancient name of Paris, France (where it was discovered) + -ium.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin Lutetia ("Paris, the capital of France"). (Wiktionary)