protoxiden.

Brit.

/prəʊˈtɒksʌɪd/, U.S.

/proʊˈtɑkˌsaɪd/

Forms: 1800s– protoxide, 1800s protoxyd, 1800s protoxyde.

Origin: Formed within English, by compounding. Etymons: proto- comb. form, oxide n.

Etymology: < proto- comb. form + oxide n. (see quot. 1804).

Chemistry. Now rare.

An oxide which contains the smallest possible proportion of oxygen in relation to the other element (i.e. one in which the other element occurs in its lowest oxidation state). Cf. proto- comb. form 3a(a), peroxide n. 1.

ΚΠ

1804 T. Thomson Syst. Chem. (ed. 2) I. 103 I shall..distinguish them..by prefixing to the word oxide the first syllable of the Greek ordinal numerals. Thus the protoxide of a metal will denote the metal combined with a minimum of oxygen, or the first oxide which the metal is capable of forming; deutoxide will denote the second oxide of a metal, or the metal combined with two doses of oxygen.

1836–41 W. T. Brande Man. Chem. (ed. 5) 609 Potassium..forms two definite compounds with oxygen, which we may call the protoxide and peroxide.

1873 London, Edinb., & Dublin Philos. Mag. 4th Ser. 45 455 As..the heating of the crucible was effected in an air-furnace,..it was conceived that some of the sesquioxide of iron might have been reduced to protoxide.

1958 Jrnl. Amer. Chem. Soc. 80 4438/2 The archaic term protoxide is used for Mn₂0.

1983 Ann. Plastic Surg. 11 227 Cryotherapy with nitrogen protoxide is both useful and practical in the management of carefully selected cases.

Derivatives

† protoxidated adj. Obsolete rare converted into a protoxide.Apparently only attested in dictionaries or glossaries.

ΚΠ

1858 R. G. Mayne Expos. Lexicon Med. Sci. (1860) 1027/2 Protoxydatus, that which is converted into the state of a protoxide, as Ferrum protoxydatum: protoxidated.

† protoxidize v. Obsolete rare (transitive) to convert into a protoxide.

ΚΠ

1828 N. Webster Amer. Dict. Eng. Lang. Protoxydize, to oxydize in the first degree.

1870 C. King Rep. Geol. Explor. 40th Parallel III. ii. 28 The white portions are either entirely free from iron, or else contain it in the protoxydized form.

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

单词	protoxide
释义	protoxiden. Brit. /prəʊˈtɒksʌɪd/, U.S. /proʊˈtɑkˌsaɪd/ Forms: 1800s– protoxide, 1800s protoxyd, 1800s protoxyde. Origin: Formed within English, by compounding. Etymons: proto- comb. form, oxide n. Etymology: < proto- comb. form + oxide n. (see quot. 1804). Chemistry. Now rare. An oxide which contains the smallest possible proportion of oxygen in relation to the other element (i.e. one in which the other element occurs in its lowest oxidation state). Cf. proto- comb. form 3a(a), peroxide n. 1. ΚΠ 1804 T. Thomson Syst. Chem. (ed. 2) I. 103 I shall..distinguish them..by prefixing to the word oxide the first syllable of the Greek ordinal numerals. Thus the protoxide of a metal will denote the metal combined with a minimum of oxygen, or the first oxide which the metal is capable of forming; deutoxide will denote the second oxide of a metal, or the metal combined with two doses of oxygen. 1836–41 W. T. Brande Man. Chem. (ed. 5) 609 Potassium..forms two definite compounds with oxygen, which we may call the protoxide and peroxide. 1873 London, Edinb., & Dublin Philos. Mag. 4th Ser. 45 455 As..the heating of the crucible was effected in an air-furnace,..it was conceived that some of the sesquioxide of iron might have been reduced to protoxide. 1958 Jrnl. Amer. Chem. Soc. 80 4438/2 The archaic term protoxide is used for Mn₂0. 1983 Ann. Plastic Surg. 11 227 Cryotherapy with nitrogen protoxide is both useful and practical in the management of carefully selected cases. Derivatives † protoxidated adj. Obsolete rare converted into a protoxide.Apparently only attested in dictionaries or glossaries. ΚΠ 1858 R. G. Mayne Expos. Lexicon Med. Sci. (1860) 1027/2 Protoxydatus, that which is converted into the state of a protoxide, as Ferrum protoxydatum: protoxidated. † protoxidize v. Obsolete rare (transitive) to convert into a protoxide. ΚΠ 1828 N. Webster Amer. Dict. Eng. Lang. Protoxydize, to oxydize in the first degree. 1870 C. King Rep. Geol. Explor. 40th Parallel III. ii. 28 The white portions are either entirely free from iron, or else contain it in the protoxydized form. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1804
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