[prey-zee-oh-dim-ee-uhm, prey-see-]
noun Chemistry.
a rare-earth, metallic, trivalent element, named from its green salts. Symbol: Pr; atomic weight: 140.91; atomic number: 59; specific gravity: 6.77 at 20°C.

1880–85; < Neo-Latin, equivalent to praseo- (combining form representing Greek prásios leek-green; see prase) + (di)dymium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
praseodymium (ˌpreɪzɪəʊˈdɪmɪəm)
a malleable ductile silvery-white element of the lanthanide series of metals. It occurs principally in monazite and bastnaesite and is used with other rare earths in carbon-arc lights and as a pigment in glass. Symbol: Pr; atomic no: 59; atomic wt: 140.90765; valency: 3; relative density: 6.773; melting pt: 931°C; boiling pt: 3520°C
[C20: New Latin, from Greek prasios of a leek-green colour + didymium]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

rare metallic element, 1885, coined in Mod.L. by discoverer Carl Auer von Welsbach (1858-1929) from Gk. prasios "leek-green" (from prason "leek") + L. (di)dymium "double." So called from the green color of the salts it forms.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

praseodymium pra·se·o·dym·i·um (prā'zē-ō-dĭm'ē-əm, prā'sē-)
Symbol Pr
A soft malleable ductile rare-earth element that develops a characteristic green tarnish in air and is used to color glass and ceramics yellow and in metallic alloy. Atomic number 59; atomic weight 140.908; melting point 931°C; boiling point 3,510°C; specific gravity 6.8; valence 3.

The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
praseodymium   (prā'zē-ō-dĭm'ē-əm)  Pronunciation Key 
Symbol Pr
A soft, malleable, silvery metallic element of the lanthanide series that develops a green tarnish in air. It is used to add a yellow tint to glass and ceramics and to make the glass used in welding goggles. Atomic number 59; atomic weight 140.908; melting point 935°C; boiling point 3,127°C; specific gravity 6.8; valence 3, 4. See Periodic Table.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


(Pr), chemical element, rare-earth metal of transition Group IIIb of the periodic table, used as the element in special alloys and, as its oxide, in glasses. Moderately soft, ductile, and malleable, this silvery metal rapidly displaces hydrogen from water and slowly reacts in air, developing a green oxide coating, which chips. For preservation, the metal must be sealed in a plastic covering or kept in mineral oil. Praseodymium was discovered in didymia, a mixture of several rare-earth oxides. From it, by repeated fractional crystallization of ammonium didymium nitrate, Carl Auer von Welsbach separated (1885) salts of the elements praseodymium (the green fraction) and neodymium. Praseodymium occurs in minerals such as monazite and bastnaesite and as one of the products of nuclear fission. Natural praseodymium is all stable isotope praseodymium-141. This element is commercially separated and purified by ion-exchange techniques; the reduction of the fluoride or chloride with calcium is one way in which the metal itself is prepared

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The sudden drop in resistivity indicates that praseodymium's bound f electrons become delocalized at this pressure.
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