from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A soft, silvery, malleable, ductile rare-earth element that develops a characteristic green tarnish in air. It occurs naturally with other rare earths in monazite and is used to color glass and ceramics yellow, as a core material for carbon arcs, and in metallic alloys. Atomic number 59; atomic weight 140.908; melting point 935°C; boiling point 3,127°C; specific gravity 6.8; valence 3, 4. See Table at element.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A metallic chemical element (symbol Pr) with an atomic number of 59.
from the GNU version of the Collaborative International Dictionary of English
- n. An elementary substance, one of the constituents of didymium; -- so called from the green color of its salts. Symbol Ps. Atomic weight 143.6.
from The Century Dictionary and Cyclopedia
- n. One of the two elements into which, in 1885, Auer von Welsbach succeeded in resolving what had previously been known as didymium. See neodymium.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process
New Latin, from German Praseodym : Greek praseos, variant of prasios, leek-green (from prason, leek) + (di)dymium.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek πράσιος ("leek-green") + didymium. (Wiktionary)