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单词 asymmetry
释义

asymmetryn.

/əˈsɪmɛtri/
Etymology: < ancient Greek ἀσυμμετρία < ἀσύμμετρος + -ια -ia suffix1 (see symmetry n.).
1. Mathematics. The relation of two quantities which have no common measure, as 1 and √2; incommensurability. ? Obsolete.
ΘΚΠ
the world > relative properties > number > mathematical number or quantity > [noun] > relationship between quantities > incommensurable
incommensurability1570
asymmetrya1652
incommensurableness1681
incommensurable1741
a1652 J. Smith Select Disc. (1660) iv. v. 93 Æquality, Proportion, Symmetry and asymmetry of Magnitudes.
1675 J. Collins Let. in S. P. Rigaud & S. J. Rigaud Corr. Sci. Men 17th Cent. (1841) (modernized text) II. 264 The method of shunning asymmetries mentioned in Des Cartes.
1796 in C. Hutton Math. & Philos. Dict. I. 162.
2.
a. Want of symmetry, defective correspondence between things or their parts, disproportion.
ΘΚΠ
the world > space > shape > misshapenness > [noun] > asymmetry
dextrality1646
asymmetry1664
one-sidedness1830
lopsidedness1843
dissymmetry1844
unsymmetry1867
sidedness1888
the world > space > relative position > arrangement or fact of being arranged > other specific arrangements > [noun] > balanced arrangement > not
asymmetry1664
1664 J. Evelyn in tr. R. Fréart Parallel Antient Archit. Ep. Ded. sig. *bv The asymmetrie of our Buildings.
1664 J. Worthington Life Mede in J. Mede Wks. p. lix There was an asymmetry and disproportion in the subservient Faculties.
1877 T. H. Huxley Man. Anat. Invertebrated Animals viii. 530 Male Cephalopods are distinguished..by the asymmetry of their arms.
1948 S. Glasstone Textbk. Physical Chem. xii. 904 The influence on the velocity of the ion is known as the relaxation effect, or sometimes as the asymmetry effect, because it arises from the lack of symmetry in the electrical atmosphere of a moving ion.
b. Chemistry. Lack of symmetry in the spatial arrangement of atoms or groups in a molecule; = stereoisomerism n. at stereo- comb. form .
ΘΚΠ
the world > matter > chemistry > isomerism > [noun] > stereo-isomerism
asymmetry1875
stereoisomerism1894
physical isomerism1896
stereomerism1898
1875 Jrnl. Chem. Soc. 28 862 He [sc. J. H. van't Hoff] has deduced the following rules... Derivatives of optically active combinations lose their rotatory power when the asymmetry of their carbon-atoms disappears.
1885 Encycl. Brit. XIX. 314/1 What peculiarity of constitution can give a molecule this helicoidal asymmetry?
1902 Encycl. Brit. XXVI. 721/1 The doctrine of asymmetry may be extended to elements other than carbon.
1959 Chambers's Encycl. III. 357/2 When two of the four attached groups are similar, as in propionic acid,..the asymmetry vanishes together with the possibility of optical isomerism.
This entry has not yet been fully updated (first published 1885; most recently modified version published online December 2018).
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n.a1652
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