substituentn.adj.

Brit.

/səbˈstɪtjʊənt/,

/səbˈstɪtʃʊənt/, U.S.

/ˌsəbˈstɪtʃ(əw)ənt/

Origin: A borrowing from German. Etymon: German Substituent.

Etymology: < German Substituent (1856 or earlier) < classical Latin substituent- , substituēns , present participle of substituere substitute v.

Chemistry.

An atom or group taking the place of another atom or group in a molecule, or occupying a specified position in a molecule. Also attributive or as adj. Cf. substitution n. 9.In quot. 1863 (apparently): something that behaves like oxygen.

ΘΚΠ

the world > matter > chemistry > atomic chemistry > [noun] > atomic groups > types

residue1852

substituent1863

fluorophore1898

bridge1901

luminophore1910

triple1952

1863 H. Watts Dict. Chem. I. 263 It is known that most elements combine in various proportions with oxygen or its substituents.

1886 H. E. Roscoe & C. Schorlemmer Treat. Chem. III. iii. 40 The assumption that the same relative position of the substituents held good for the ortho- and meta- compounds of the two groups was in no way proved.

1905 Brit. Med. Jrnl. 27 May 1144/1 A substance having the structure of cinnamic acid, with a hydroxyl (OH) substituent.

1939 D. R. White & J. R. Weber in K. Henney & B. Dudley Handbk. Photogr. xi. 321 The relative positioning of the substituent groups and the kind of substituent has a decided influence on the relative activity of the agent as a photographic developer.

1982 G. C. Hill & J. S. Holman Chem. in Context: Lab. Man. & Study Guide 95 The single-step mechanism..is favoured by the presence of substituent hydrogen atoms.

2001 Chemicals & Materials from Renewable Resources (ACS Symposium Ser. No. 784) xii. 149 Relatively minor changes in the substituents attached to the polymethylene chain drastically alter the physical properties of polyolefins.

This entry has been updated (OED Third Edition, June 2012; most recently modified version published online March 2022).

单词	substituent
释义	substituentn.adj. Brit. /səbˈstɪtjʊənt/, /səbˈstɪtʃʊənt/, U.S. /ˌsəbˈstɪtʃ(əw)ənt/ Origin: A borrowing from German. Etymon: German Substituent. Etymology: < German Substituent (1856 or earlier) < classical Latin substituent- , substituēns , present participle of substituere substitute v. Chemistry. An atom or group taking the place of another atom or group in a molecule, or occupying a specified position in a molecule. Also attributive or as adj. Cf. substitution n. 9.In quot. 1863 (apparently): something that behaves like oxygen. ΘΚΠ the world > matter > chemistry > atomic chemistry > [noun] > atomic groups > types residue1852 substituent1863 fluorophore1898 bridge1901 luminophore1910 triple1952 1863 H. Watts Dict. Chem. I. 263 It is known that most elements combine in various proportions with oxygen or its substituents. 1886 H. E. Roscoe & C. Schorlemmer Treat. Chem. III. iii. 40 The assumption that the same relative position of the substituents held good for the ortho- and meta- compounds of the two groups was in no way proved. 1905 Brit. Med. Jrnl. 27 May 1144/1 A substance having the structure of cinnamic acid, with a hydroxyl (OH) substituent. 1939 D. R. White & J. R. Weber in K. Henney & B. Dudley Handbk. Photogr. xi. 321 The relative positioning of the substituent groups and the kind of substituent has a decided influence on the relative activity of the agent as a photographic developer. 1982 G. C. Hill & J. S. Holman Chem. in Context: Lab. Man. & Study Guide 95 The single-step mechanism..is favoured by the presence of substituent hydrogen atoms. 2001 Chemicals & Materials from Renewable Resources (ACS Symposium Ser. No. 784) xii. 149 Relatively minor changes in the substituents attached to the polymethylene chain drastically alter the physical properties of polyolefins. This entry has been updated (OED Third Edition, June 2012; most recently modified version published online March 2022). < n.adj.1863
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