pyrethricadj.

Brit.

/pʌɪˈriːθrɪk/, U.S.

/paɪˈriθrɪk/,

/paɪˈrɛθrɪk/

Origin: Formed within English, by derivation; modelled on a German lexical item. Etymons: pyrethrum n., -ic suffix.

Etymology: < pyrethr- (pyrethrum n.) + -ic suffix. In pyrethric acid n. (b) at main sense after German Pyrethrinsaüre (R. Buchheim 1876, in Neues Repertorium f. die Pharm. 25 339). Compare earlier pyrethrine n.

Chemistry.

pyrethric acid n. †(a) a resinous acid obtained from the root of the pellitory, Anacyclus pyrethrum (obsolete); (b) a terpenoid acid obtained from the root of the pellitory, Anacyclus pyrethrum, and related to the pyrethrins; cf. pyrethrine n.

ΚΠ

1855 A. B. Garrod Essentials Materia Medica 178 It [sc. pyrethrum] contains at least two resins, one of which has been named Pyrethric acid.

1877 Jrnl. Chem. Soc. 2 195 On treatment with alcoholic potash, it [sc. pyrethrine] splits up into piperidine, and an acid..named by the author pyrethric acid.

1961 Jrnl. Agric. & Food Chem. 9 391/3 Pyrethric acid..was not steam distillable.

2001 Proc. National Acad. Sci. U.S.A. 98 4377/2 Chrysanthemic and pyrethric acids are irregular monoterpenes.

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

单词	pyrethric
释义	pyrethricadj. Brit. /pʌɪˈriːθrɪk/, U.S. /paɪˈriθrɪk/, /paɪˈrɛθrɪk/ Origin: Formed within English, by derivation; modelled on a German lexical item. Etymons: pyrethrum n., -ic suffix. Etymology: < pyrethr- (pyrethrum n.) + -ic suffix. In pyrethric acid n. (b) at main sense after German Pyrethrinsaüre (R. Buchheim 1876, in Neues Repertorium f. die Pharm. 25 339). Compare earlier pyrethrine n. Chemistry. pyrethric acid n. †(a) a resinous acid obtained from the root of the pellitory, Anacyclus pyrethrum (obsolete); (b) a terpenoid acid obtained from the root of the pellitory, Anacyclus pyrethrum, and related to the pyrethrins; cf. pyrethrine n. ΚΠ 1855 A. B. Garrod Essentials Materia Medica 178 It [sc. pyrethrum] contains at least two resins, one of which has been named Pyrethric acid. 1877 Jrnl. Chem. Soc. 2 195 On treatment with alcoholic potash, it [sc. pyrethrine] splits up into piperidine, and an acid..named by the author pyrethric acid. 1961 Jrnl. Agric. & Food Chem. 9 391/3 Pyrethric acid..was not steam distillable. 2001 Proc. National Acad. Sci. U.S.A. 98 4377/2 Chrysanthemic and pyrethric acids are irregular monoterpenes. This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022). < adj.1855
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