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单词 roccellic
释义

roccellicadj.

Brit. /rɒkˈsɛlɪk/, U.S. /ˌrɑkˈsɛlɪk/
Origin: A borrowing from Latin, combined with an English element; perhaps modelled on a French lexical item, or perhaps modelled on a German lexical item. Etymons: Latin Roccella , -ic suffix.
Etymology: < scientific Latin Roccella, genus name (A. P. de Candolle 1805, in Lamarck & A. P. de Candolle Flore française II. 334; < post-classical Latin roccella (1623 or earlier); further etymology uncertain: perhaps related to the Romance nouns cited at orchil n., and if so, apparently showing metathesis; compare Italian roccella (a1823)) + -ic suffix, after French roccellique (1831 or earlier in acide roccellique roccellic acid) or its model German Roccell- (in Roccellsäure roccellic acid: F. Heeren 1830, in Jrnl. f. Chem. u. Physik 59 346).
Chemistry.
1. roccellic acid n. a crystalline carboxylic acid related to succinic acid, and found in certain lichens of genera that include Roccella and Lecanora.Systematic name: (2R,3S)-2-dodecyl-3-methylbutanedioic acid; C17H32O4.
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the world > matter > chemistry > organic chemistry > acids obtained from plants or trees > [noun] > miscellaneous others
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gummic acid1838
retinic acid1838
roccellic acid1838
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lobelic acid1840
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roccelline1840
humic1844
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tannocaffeic acidc1865
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pectous acid1866
phytomelin1866
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frangulic1872
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1838 T. Thomson Chem. Org. Bodies 128 Of roccellic acid. This acid was discovered by Dr. Heeren in the Rocella tinctoria.
1884 H. E. Roscoe & C. Schorlemmer Treat. Chem. III. ii. 289 Roccellic acid is insoluble in boiling water, but dissolves very easily in alcohol and ether.
1946 Thorpe's Dict. Appl. Chem. (ed. 4) VII. 287/2 Roccellic Acid..is found in several lichens of different types.
1998 Lichenologist 30 21 It is close to other Fellhanera species,..but it differs in the paler soredia, smaller, 1-septate and constricted ascospores and the presence of roccellic acid.
2. roccellic anhydride n. rare the anhydride of roccellic acid, an oily liquid obtained by heating the acid.Formula: C17H30O3.
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1864 H. Watts tr. L. Gmelin Hand-bk. Chem. XVI. 477 (heading) Roccellic anhydride.
1975 Jrnl. Chem. Soc.: Perkin Trans. 1 847/1 Natural roccellic acid was heated under reflux with an excess of acetyl chloride for 3 h. Evaporation and distillation of the residue gave roccellic anhydride.
This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).
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adj.1838
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