PR

Dictionary.com Unabridged

Pr

Symbol, Chemistry.

Pr.

1.
(of stock) preferred.

pr.

1.
pair; pairs.
5.
(of stock) preferred.
9.
Computers. printer.

P.R.

1
Roman people.

Origin:
< Latin populus Rōmānus

P.R.

2
1.
parliamentary report.
2.
press release.
3.
prize ring.
4.
proportional representation.
5.
public relations. Also, p.r.
6.
Puerto Rico.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
pr
 
abbreviation for , prs
1.  pair
2.  paper
3.  (in prescriptions) per rectum
4.  power
 
[(sense 3) Latin: through the rectum; to be inserted into the anus]

pr
 
the internet domain name for
Puerto Rico

Pr
 
the chemical symbol for
praseodymium

PR
 
abbreviation for
1.  proportional representation
2.  public relations
3.  Puerto Rico

Pr.
 
abbreviation for
1.  Priest
2.  Prince

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

Pr 1

The symbol for the element praseodymium.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
Pr  
The symbol for praseodymium.
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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FOLDOC
Computing Dictionary

PR definition


Packet Radio

pr definition

networking
The country code for Puerto Rico.
(1999-01-27)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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American Heritage
Abbreviations & Acronyms
pr
preferences
Pr
  1. praseodymium

  2. propyl

  3. Proverbs

PR
  1. payroll

  2. proportional representation

  3. public relations

  4. Puerto Rico

pr.
  1. pair

  2. present

  3. printed

  4. printing

  5. pronoun

p.r.
Latin punctum remotum (far point)
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

pr

((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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