“digonal”的英文意思_释义_用法

单词

digonal

释义

digonal, a. Cryst.|ˈdɪgənəl, daɪˈgəʊnəl|
[f. di-² + Gr. γωνία angle + -al.]
Denoting an axis of two-fold symmetry.
1890G. H. Williams Elem. Crystallogr. (ed. 2) iii. 47 Two other sets of axes are of use in the isometric system. One is the set of intersection-lines between the principal and secondary planes of symmetry... The first..are called the digonal.1898Nature 27 Jan. 309 Only digonal, trigonal, [tetragonal,] and hexagonal axes [of symmetry] are possible with crystals.1911A. E. Tutton Crystallography x. 136 A digonal axis..is such that half a complete revolution about it restores the original appearance of the crystal.1929H. A. Miers Mineralogy (ed. 2) i. 65 The crystals of this class..possess three digonal axes coinciding with the crystal axes, and no other symmetry.

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