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Pr,symbol for the element praseodymiumpraseodymium
[Gr., =green twin], metallic chemical element; symbol Pr; at. no. 59; at. wt. 140.90765; m.p. 931°C;; b.p. 3,512°C;; sp. gr. about 6.8; valence +3 or +4. Praseodymium is a soft, malleable, ductile, silver-yellow metal.
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Puerto Rico Parks
Parks Directory of the United States, 5th Edition. © 2007 by Omnigraphics, Inc.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
On drawings, abbr. for “pair.”
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
The country code for Puerto Rico.
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