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pyrophosphoric acid

[pahy-roh-fos-fawr-ik, -for-, pahy-] /ˈpaɪ roʊ fɒsˈfɔr ɪk, -ˈfɒr-, ˌpaɪ-/
noun, Chemistry
1.
a crystalline, water-soluble powder, H 4 P 2 O 7 , formed by the union of one molecule of phosphorus pentoxide with two molecules of water.
Origin
1865-1870
1865-70; pyro- + phosphoric
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pyro-phosphoric acid

pyrophosphoric acid

/ˌpaɪrəʊfɒsˈfɒrɪk/
noun
1.
a crystalline soluble solid acid formed by the reaction between one molecule of phosphorus pentoxide and two water molecules. Formula: H4P2O7 See also polyphosphoric acid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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pyro-phosphoric acid in Medicine

pyrophosphoric acid py·ro·phos·phor·ic acid (pī'rō-fŏs-fôr'ĭk)
n.
A syrupy viscous liquid used as a catalyst, in organic chemical synthesis, and, in its salt forms, as medicines.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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pyro-phosphoric acid in Science
pyrophosphoric acid
  (pī'rō-fŏs-fôr'ĭk)   
A viscous liquid used as a catalyst and in the manufacture of organic chemicals. Chemical formula: H4P2O7.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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