单词 | conchoidal |
释义 | conchoidaladj. 1. Geometry. Pertaining to, or resembling, a conchoid. ΘΚΠ the world > relative properties > number > geometry > curve > [adjective] > relating to curve of specific order conchoidal1666 semi-cubic1673 semi-cubical1674 cubical1728 cissoidal1796 bicircular1867 1666 J. Collins Let. in S. P. Rigaud & S. J. Rigaud Corr. Sci. Men 17th Cent. (1841) (modernized text) II. 469 Let there be points made in a curve, which will be conchoidal or asymptotic. 1879 G. Salmon Treat. Higher Plane Curves v. 172 The serpentine is exchanged for the conchoidal form. 2. Mineralogy, etc. Applied to a fracture presenting smooth shell-like convexities and concavities. ΘΚΠ the world > the earth > minerals > mineral structure or appearance > [adjective] > cleavage or fracture beddy1709 splintery1794 conchoid1802 conchoidal1802 graphic1814 axotomous1834 fendillated1853 plagioclastic1869 plagioclasic1913 1802 J. Playfair Illustr. Huttonian Theory 287 Their fracture was conchoidal and but slightly uneven. 1865 J. Lubbock Prehist. Times iii. 64 A splintery conchoidal fracture almost as sharp as that of flint. This entry has not yet been fully updated (first published 1891; most recently modified version published online June 2018). < adj.1666 |
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