usnicadj.

Forms: Also usneic.

Etymology: < usn- (in Usnea n.) + -ic suffix 1b.Previous versions of the OED give the stress as: ˈusnic.

Chemistry.

usnic acid n. carbusnic acid; usnin.

ΘΚΠ

the world > matter > chemistry > organic chemistry > acids obtained from plants or trees > [noun] > carbonic acid

usnic acid1847

usnin1861

1847 W. Gregory Outl. Chem. (rev. ed. 2) ii. 502 Usnic Acid..is found in many lichens,..and in many species of Usnea [etc.].

1848 G. Fownes Man. Elem. Chem. (ed. 2) 514 The Usnea barbata and several other lichens contain usneic acid.

1861 H. Macmillan Footnotes from Nature 82 Alpine lichens generally are more or less of a brown or black colour. This peculiarity seems to be owing to the presence of usnine or usnic acid.

1867 W. T. Brande & G. W. Cox Dict. Sci., Lit. & Art (new ed.) III. 912/2 Usnin or Usnic Acid..forms yellow crystals, which with great difficulty are fused like a resin.

This entry has not yet been fully updated (first published 1926; most recently modified version published online December 2020).

单词	usnic
释义	usnicadj. Forms: Also usneic. Etymology: < usn- (in Usnea n.) + -ic suffix 1b.Previous versions of the OED give the stress as: ˈusnic. Chemistry. usnic acid n. carbusnic acid; usnin. ΘΚΠ the world > matter > chemistry > organic chemistry > acids obtained from plants or trees > [noun] > carbonic acid usnic acid1847 usnin1861 1847 W. Gregory Outl. Chem. (rev. ed. 2) ii. 502 Usnic Acid..is found in many lichens,..and in many species of Usnea [etc.]. 1848 G. Fownes Man. Elem. Chem. (ed. 2) 514 The Usnea barbata and several other lichens contain usneic acid. 1861 H. Macmillan Footnotes from Nature 82 Alpine lichens generally are more or less of a brown or black colour. This peculiarity seems to be owing to the presence of usnine or usnic acid. 1867 W. T. Brande & G. W. Cox Dict. Sci., Lit. & Art (new ed.) III. 912/2 Usnin or Usnic Acid..forms yellow crystals, which with great difficulty are fused like a resin. This entry has not yet been fully updated (first published 1926; most recently modified version published online December 2020). < adj.1847
随便看	catholicates catholicise catholicised catholicises catholicising catholicism catholicist catholicities catholicity catholicization catholicize catholicized catholicizes catholicizing catholicly catholicminded catholicmindedness catholicness catholico catholico- catholicoi catholicon catholicons catholicos catholicos patriarch