† monothionicadj.

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

Etymology: < mono- comb. form + -thionic comb. form, after German Monothionsäure monothionic acid (Berzelius Lehrb. der Chem. (ed. 5, 1843) I. 462). Compare dithionic adj., trithionic adj., polythionic adj. N.E.D. (1908) gives the pronunciation as (mǫnoþəiǫ·nik) /mɒnəʊθaɪˈɒnɪk/.

Chemistry. Obsolete. rare.

monothionic acid n.

a. Either of the two acids sulphuric acid and sulphurous acid, whose molecules contain one atom of sulphur.

ΚΠ

1844 Chem. Gaz. 1 Feb. 66 Berzelius..separates the acids of sulphur into monothionic acids (sulphuric and sulphurous acids), dithionic acids..trithionic acid (Langlois' sulphated hyposulphuric acid).

b. A highly unstable acid whose organic derivatives are stable and are used as reducing agents; sulphoxylic acid, S(OH)₂.

ΚΠ

1892 New Sydenham Soc. Lexicon Monothionic acid, H₂SO₂. A yellow, powerfully reducing, very unstable fluid, obtained by the action of diluted sulphuric acid on iron or zinc, with exclusion of air.

This entry has been updated (OED Third Edition, December 2002; most recently modified version published online June 2018).

单词	monothionic
释义	† monothionicadj. Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: mono- comb. form, -thionic comb. form. Etymology: < mono- comb. form + -thionic comb. form, after German Monothionsäure monothionic acid (Berzelius Lehrb. der Chem. (ed. 5, 1843) I. 462). Compare dithionic adj., trithionic adj., polythionic adj. N.E.D. (1908) gives the pronunciation as (mǫnoþəiǫ·nik) /mɒnəʊθaɪˈɒnɪk/. Chemistry. Obsolete. rare. monothionic acid n. a. Either of the two acids sulphuric acid and sulphurous acid, whose molecules contain one atom of sulphur. ΚΠ 1844 Chem. Gaz. 1 Feb. 66 Berzelius..separates the acids of sulphur into monothionic acids (sulphuric and sulphurous acids), dithionic acids..trithionic acid (Langlois' sulphated hyposulphuric acid). b. A highly unstable acid whose organic derivatives are stable and are used as reducing agents; sulphoxylic acid, S(OH)₂. ΚΠ 1892 New Sydenham Soc. Lexicon Monothionic acid, H₂SO₂. A yellow, powerfully reducing, very unstable fluid, obtained by the action of diluted sulphuric acid on iron or zinc, with exclusion of air. This entry has been updated (OED Third Edition, December 2002; most recently modified version published online June 2018). < adj.1844
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