单词 | acicular |
释义 | acicularadj. Chiefly Chemistry, Mineralogy, and Botany. Esp. of crystals and leaves: needle-shaped; long and slender. ΘΚΠ the world > plants > part of plant > thorn or prickle > [adjective] > thorn- or spine-shaped acicular1709 spinescent1793 aculeiform1809 aciculated1819 aciculiform1846 aciculine1847 spinulose1848 spinoid1882 the world > matter > chemistry > crystallography (general) > crystal (general) > crystal habit > [adjective] > needle-like acicular1709 spiculated1738 spiculine1755 aciform?a1808 aciculine1847 1709 W. King Useful Trans. in Philos. Mar.–Apr. 30 These long Acicular sharp Particles. 1794 Philos. Trans. (Royal Soc.) 84 396 Oxalic acid produced immediately a precipitation of white acicular crystals. 1848 J. D. Dana U.S. Exploring Exped.: Zoophytes (new ed.) 449 With long acicular, and nearly naked branchlets. 1852 H. W. Dulcken tr. I. L. Pfeiffer Visit Holy Land, Egypt, & Italy ix. 138 I noticed, in a little ravine, a group of eight acicular-leaved trees. 1860 J. Ruskin Mod. Painters V. 182 Their trees always had a tendency to congeal into little acicular thorn-hedges. 1965 Austral. Encycl. VI. 266/2 Shrubs or small trees possessing rigid acicular leaves. 1966 Palaeontol. 9 623 Bundles of long acicular setae. 1995 Mineral. Mag. 59 170 Acicular millerite from ironstone nodules in the South Wales Coalfield. Derivatives aˌcicuˈlarity n. the property (of crystals or other particles) of being acicular; a measure of this property. ΘΚΠ the world > space > shape > fact or condition of tapering > condition of tapering to a point > [noun] > fact of having (a) point(s) pungency1654 acicularity1935 1935 Industr. & Engin. Chem. 27 907/1 The difference in the weathering behavior of the two zinc oxides can be ascribed to a slight acicularity of the better zinc oxide. 1996 H. Sugaya in C. D. Mee & E. D. Daniel Magn. Storage Handbk. (ed. 2) v. 65 Different acicularities are obtained by different types of magnetic pigment. 2005 Ceramic Industry (Nexis) Oct. 23 New wollastonite grades that take advantage of this material's unique crystal acicularity. This entry has been updated (OED Third Edition, September 2009; most recently modified version published online June 2022). < |
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