| 单词 | trigonal symmetry |
| 释义 | > as lemmastrigonal symmetry b. Geometry and Crystallography. Applied to a solid figure with triangular faces, or having some other relation to a triangle. Also, Having a relation to three angles: as trigonal quoin, a solid angle contained by three plane angles; trigonal symmetry, the symmetry of a figure or body which coincides with its original position after rotation about an axis through an angle of 120° or 240°. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > specific crystal forms > [adjective] > miscellaneous others secondary1816 trapezian1816 triacontahedral1816 tri-dodecahedral1816 tri-hexahedral1816 tri-octahedral1816 tri-rhomboidal1816 octodecimal1817 octoduodecimal1817 octosexdecimal1817 pentahexahedral1817 octahedrala1824 trigonal1878 pinacoidal1879 tetartopyramid1891 trisoctahedral1891 tetartohexagonal1895 tetartosystematic1895 the world > matter > chemistry > crystallography (general) > crystal (general) > crystal symmetry > [noun] > types of orthosymmetry1878 trigonal symmetry1878 holosymmetry1895 tetartosymmetry1895 self-coincidence1904 the world > matter > chemistry > crystallography (general) > crystal (general) > crystal symmetry > [noun] > angle types trigonal quoin1878 the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > having faces of particular shape trapezoidal1794 trapezoidiform1826 rhombohedric1830 pentagonal1837 trapezohedral1849 trigonal1878 1878 H. P. Gurney Crystallogr. 38 If three symmetral planes and no more intersect in the same straight line, it is called an axis of trigonal symmetry. 1891 Cent. Dict. at Trisoctahedron The trigonal trisoctahedron has each face an isosceles triangle. 1895 N. Story-Maskelyne Crystallogr. iv. §79. 98 A plane figure may..be symmetrical with regard to a point within it as a pole of symmetry... Where n = 2, or = 3, 4, or 6, the symmetry may be defined as being diagonal, trigonal, tetragonal, or hexagonal. 1895 N. Story-Maskelyne Crystallogr. vii. §180. 211 The trigonal dodecahedron,..a tetrahedron with a three-faced pyramid on each of its faces. 1895 N. Story-Maskelyne Crystallogr. vii. §257. 302 The trigonal trapezohedron..has trapezoids for its faces, which meet in two trigonal quoins. < as lemmas |
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