单词 | suprafacial |
释义 | suprafacialadj. 1. Anatomy and Zoology. Located above the face or the facial nerve. ΚΠ 1883 Trans. Med. Assoc. Missouri 231 Suprafacial cutaneous [neuralgia]. 1911 W. L. Ballenger Dis. Nose, Throat & Ear (ed. 3) 872 (caption) Showing the complete exposure of the three semicircular canals and the upper or suprafacial aspect of the vestibule. 1929 Philos. Trans. (Royal Soc.) B. 217 414 The suprafacial commissure is morphologically a lateral appendage of the central stem, but in mammals it is closely associated with the auditory capsule. 1996 Jrnl. Paleontol. 70 1055/2 The dorsolateral ridge is modified by the expansion of the suprafacial (prefacial) commissure in the petrosals of Parietobalaena palmeri. 2. Chemistry. Of a pericyclic reaction undergone by a molecule: involving the formation of two new bonds on the same face of the molecule. Opposed to antarafacial adj. ΘΚΠ the world > matter > chemistry > chemical bonding > [adjective] > of or relating to suprafacial bonding suprafacial1965 1965 R. B. Woodward & R. Hoffmann in Jrnl. Amer. Chem. Soc. 87 2512/1 In the first process, here designated suprafacial, the hydrogen atom is associated at all times with the same face of the π-system. 1980 E. N. Marvell Thermal Electrocyclic Reactions i. 5 Thus for a π bond a suprafacial process forms new connections on the same side of the nodal plane. 2010 F. A. Carroll Perspectives Struct. & Mechanism Org. Chem. (ed. 2) xi. 717 The concerted suprafacial pathway is therefore forbidden by the principles of orbital symmetry. This entry has been updated (OED Third Edition, June 2012; most recently modified version published online March 2022). < adj.1883 |
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