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单词 conchoidal
释义

conchoidaladj.

/kɒŋˈkɔɪdəl/
Etymology: formed as conchoid n. + -al suffix1.
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).
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adj.1666
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