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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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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
Parks Directory of the United States, 5th Edition. © 2007 by Omnigraphics, Inc.

Pr

(chemistry)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

PR

On drawings, abbr. for “pair.”
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

PR

(1)

pr

(networking)
The country code for Puerto Rico.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
References in periodicals archive ?
The judge found that P.R. died from oxygen deprivation that had been the result of intentional drowning or suffocation.
Specifically, the judge found that Rams had been in dire financial straits, stood to benefit financially from P.R.'s death, and noted that messages between Rams and his realtor suggested that Rams expected his finances to improve.
P.R. comes in many forms, ranging from national "party list" systems in South Africa and Sweden to Germany's "mixed" system (half the seats are elected from one-seat districts, half from party, lists) to the candidate-based preference voting system used in Ireland and Australia - and perhaps soon in San Francisco.
The contemporary use of P.R. has moved way beyond issuing ho-hum news releases and engaging in damage control.
One P.R. professional estimates that 75 percent of all major law firms now use PR consultants.