American Heritage® Dictionary of the English Language, Fourth 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.
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. Praseodymium forms two oxids—Pr2O3, which is of a dingy greenish-white color, and PrO2, which is dark blackish-brown. The salts are bright leek-green when crystallized or in solution, and give an absorption-spectrum which contains few of the lines of the original didymium. A characteristic spark-spectrum can also be obtained. The atomic weight of praseodymium is 139.4 (H = 1) or 140.5 (O = 16).
- n. A metallic chemical element (symbol Pr) with an atomic number of 59.
GNU Webster's 1913
- n. (Chem.) An elementary substance, one of the constituents of didymium; -- so called from the green color of its salts. Symbol Ps. Atomic weight 143.6.
- 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
- From Ancient Greek πράσιος ("leek-green") + didymium. (Wiktionary)
- 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)
“To slow down the light, the researchers used a silicate crystal doped with a rare-earth element called praseodymium .”
“I doubt if your people would take kindly to ... say ... catastrophic inflation when we released several tons of the praseodymium which is your standard, followed by depression and unemployment when a number of key corporations retired from business. ”
“China supplies at least 95% of the world's rare earths -- 17 chemical elements with hard-to-pronounce names such as praseodymium and yttrium -- essential for a wide range of high-tech devices and green technologies.”
“Zume Press, Reuters, Agence France-Presse/Getty Images Molycorp, at its Mountain Pass facility, mines rare-earth elements like neodymium and praseodymium, upper right, which are used in the manufacturing of products like Apple's iPad.”
“Magnets made with the rare-earth minerals neodymium and praseodymium are uniquely strong, making them valuable components in wind turbines and computer hard drives.”
“Chinese prices of neodymium oxide have fallen 35% since June; praseodymium oxide has shed 17% and lanthanum oxide 21% in the period, according to data from Australian rare earth producer Lynas Corp.”
“The SRB has also been accumulating aluminium, zinc, nickel, and rarer metals such as titanium, indium (thin-film technology), rhodium (catalytic converters) and praseodymium (glass).”
“Didymium, at first thought to be an element, is a mixture of praseodymium and neodymium.”
“Among other things, it recommends that a defense agency that oversees strategic stockpiles develop "risk mitigation strategies" for some elements, including dysprosium, yttrium, praseodymium and neodymium.”
“Didymium is a combination of two rare-earth elements, praseodymium and neodymium.”
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