noun Chemistry.
a salt or ester of pyrophosphoric acid.

1830–40; pyrophosph(oric acid) + -ate2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pyrophosphate (ˌpaɪrəʊˈfɒsfeɪt)
any salt or ester of pyrophosphoric acid

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

pyrophosphate py·ro·phos·phate (pī'rə-fŏs'fāt')
Abbr. PP
A salt or an ester of pyrophosphoric acid.

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
pyrophosphate   (pī'rə-fŏs'fāt')  Pronunciation Key 
A salt or ester of pyrophosphoric acid, containing the group P2O7.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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