metaphosphoricadj.

Brit.

/ˌmɛtəfɒsˈfɒrɪk/, U.S.

/ˈˌmɛdəfɑsˈfɔrɪk/

Origin: Formed within English, by derivation. Etymons: meta- prefix, phosphoric adj.

Etymology: < meta- prefix + phosphoric adj. (see quot. 1833 for metaphosphoric acid n.), perhaps after pyrophosphoric acid n. at pyrophosphoric adj. Compare French métaphosphorique (1835). Compare metaphosphate n.

Chemistry.

metaphosphoric acid n. the least hydrated of the higher oxoacids of phosphorus, having the general formula HPO₃, and generally obtained, as a glassy deliquescent solid, by heating orthophosphoric acid.

ΚΠ

1833 T. Graham in Philos. Trans. (Royal Soc.) 123 277 I shall take the liberty to designate provisionally the acid of the fused biphosphate of soda, the Metaphosphoric acid, from an hypothesis of its constitution.

1866–8 H. Watts Dict. Chem. IV. 539 Pyrophosphoric acid is converted into metaphosphoric acid when heated to redness.

1899 J. Cagney tr. R. von Jaksch Clin. Diagnosis (ed. 4) vii. 299 If to urine which contains albumin a little solid metaphosphoric acid be added, a precipitate or turbidity forms.

1922 T. M. Lowry Inorg. Chem. xxvii. 432 Metaphosphoric acid, HPO₃,..is obtained as a transparent, deliquescent glass, to which the name glacial phosphoric acid is given, by igniting orthophosphoric acid.

1967 Jrnl. Pediatrics 70 204/1 A common denominator of the three methods for measuring GSH [sc. glutathione] is preparation of a filtrate which is protein free by the use of strong acids: metaphosphoric in the nitroprusside and alloxan methods.

1991 Gen. & Compar. Endocrinol. 84 135 The supernatant of the alkaline extract (pH 9.5) was precipitated with 0.15 M ammonium sulfate and metaphosphoric acid, pH 4.0.

This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).

单词	metaphosphoric
释义	metaphosphoricadj. Brit. /ˌmɛtəfɒsˈfɒrɪk/, U.S. /ˈˌmɛdəfɑsˈfɔrɪk/ Origin: Formed within English, by derivation. Etymons: meta- prefix, phosphoric adj. Etymology: < meta- prefix + phosphoric adj. (see quot. 1833 for metaphosphoric acid n.), perhaps after pyrophosphoric acid n. at pyrophosphoric adj. Compare French métaphosphorique (1835). Compare metaphosphate n. Chemistry. metaphosphoric acid n. the least hydrated of the higher oxoacids of phosphorus, having the general formula HPO₃, and generally obtained, as a glassy deliquescent solid, by heating orthophosphoric acid. ΚΠ 1833 T. Graham in Philos. Trans. (Royal Soc.) 123 277 I shall take the liberty to designate provisionally the acid of the fused biphosphate of soda, the Metaphosphoric acid, from an hypothesis of its constitution. 1866–8 H. Watts Dict. Chem. IV. 539 Pyrophosphoric acid is converted into metaphosphoric acid when heated to redness. 1899 J. Cagney tr. R. von Jaksch Clin. Diagnosis (ed. 4) vii. 299 If to urine which contains albumin a little solid metaphosphoric acid be added, a precipitate or turbidity forms. 1922 T. M. Lowry Inorg. Chem. xxvii. 432 Metaphosphoric acid, HPO₃,..is obtained as a transparent, deliquescent glass, to which the name glacial phosphoric acid is given, by igniting orthophosphoric acid. 1967 Jrnl. Pediatrics 70 204/1 A common denominator of the three methods for measuring GSH [sc. glutathione] is preparation of a filtrate which is protein free by the use of strong acids: metaphosphoric in the nitroprusside and alloxan methods. 1991 Gen. & Compar. Endocrinol. 84 135 The supernatant of the alkaline extract (pH 9.5) was precipitated with 0.15 M ammonium sulfate and metaphosphoric acid, pH 4.0. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022). < adj.1833
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