pyrophosphoricadj.

Brit.

/ˌpʌɪrə(ʊ)fɒsˈfɒrɪk/, U.S.

/ˈˌpaɪroʊˌfɑsˈfɔrɪk/

Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: pyro- comb. form, phosphoric adj.

Etymology: < pyro- comb. form + phosphoric adj., after German Pyrophosphorsäure pyrophosphoric acid (F. Stromeyer 1830, in Göttingische gelehrte Anzeigen 105). Compare slightly earlier pyrophosphate n.

Chemistry.

pyrophosphoric acid n. a tetrabasic acid obtained as a glassy solid by heating orthophosphoric acid.Formula: (HO)₂PO·O·PO(OH)₂.

ΚΠ

1830 Edinb. Jrnl. Sci. 3 319 Phosphoric becomes pyrophosphoric acid when heated alone, as well as when combined with an alkaline base.

1898 Science 26 Aug. 238/2 The solutions of the alkaline salts give, with solutions of the heavy metals, precipitates which contain only pyrophosphoric acid and neither tungsten nor molybdenum.

1949 Thorpe's Dict. Appl. Chem. (ed. 4) IX. 505/2 Pyrophosphoric acid is not used as a starting point for the large-scale manufacture of pyrophosphates.

2002 D. L. Erwin Industr. Chem. Process Design xi. 619 Pyrophosphoric acid is formed by the mutual dehydration of two molecules of H₃PO₄ by application of heat.

This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).

单词	pyrophosphoric
释义	pyrophosphoricadj. Brit. /ˌpʌɪrə(ʊ)fɒsˈfɒrɪk/, U.S. /ˈˌpaɪroʊˌfɑsˈfɔrɪk/ Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: pyro- comb. form, phosphoric adj. Etymology: < pyro- comb. form + phosphoric adj., after German Pyrophosphorsäure pyrophosphoric acid (F. Stromeyer 1830, in Göttingische gelehrte Anzeigen 105). Compare slightly earlier pyrophosphate n. Chemistry. pyrophosphoric acid n. a tetrabasic acid obtained as a glassy solid by heating orthophosphoric acid.Formula: (HO)₂PO·O·PO(OH)₂. ΚΠ 1830 Edinb. Jrnl. Sci. 3 319 Phosphoric becomes pyrophosphoric acid when heated alone, as well as when combined with an alkaline base. 1898 Science 26 Aug. 238/2 The solutions of the alkaline salts give, with solutions of the heavy metals, precipitates which contain only pyrophosphoric acid and neither tungsten nor molybdenum. 1949 Thorpe's Dict. Appl. Chem. (ed. 4) IX. 505/2 Pyrophosphoric acid is not used as a starting point for the large-scale manufacture of pyrophosphates. 2002 D. L. Erwin Industr. Chem. Process Design xi. 619 Pyrophosphoric acid is formed by the mutual dehydration of two molecules of H₃PO₄ by application of heat. This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022). < adj.1830
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