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Webster's 1913 Dictionary

PYROPHOSPHORIC

Pyr `o *phos *phor "ic, a. Etym: [Pyro- + phosphoric. ] (Chem. )

 

Defn: Pertaining to, or designating, an acid, H4P2O7, which is obtained as a white crystalline substance. Its salts are obtained by heating the phosphates.

 

New American Oxford Dictionary

pyrophosphoric acid

py ro phos phor ic ac id |ˌpīrōˌfäsˈfôrik, -ˈfäsfərik ˌpaɪroʊˌfɑsˌfɔrɪk ˈæsəd | ▶noun Chemistry a glassy solid obtained by heating phosphoric acid. [A tetrabasic acid; chem. formula: H 4 P 2 O 7. ] DERIVATIVES py ro phos phate |-ˈfäsˌfāt |noun

 

Oxford Dictionary

pyrophosphoric acid

pyrophosphoric acid |ˌpʌɪrə (ʊ )fɒsˈfɒrɪk | ▶noun [ mass noun ] Chemistry a glassy solid obtained by heating phosphoric acid. ●A tetrabasic acid; chem. formula: H 4 P 2 O 7.