tetrakis-hexahedronn.

Etymology: < Greek τετράκις four times + hexahedron n.Previous versions of the OED give the stress as: ˌtetrakis-hexaˈhedron.

A solid figure contained by twenty-four equal triangular planes, having the appearance of a cube with a low pyramid raised on each of its six faces. (In Crystallography belonging to the isometric system.) In Geometry the name is specially applied to the figure when the pyramids are of such a height that all the adjacent faces are equally inclined to each other, so that the figure meets the sphere circumscribing the fundamental cube at fourteen points. Also called tetrahexahedron (b), cube-pyramidion, and fluoroid.

ΘΚΠ

the world > matter > chemistry > crystallography (general) > crystal (general) > specific crystal forms > [noun]

tripyramid1828

trisoctahedron1837

fluoroid1850

sphenoid1855

discalenohedron1872

prism1878

tetrakis-hexahedron1878

galenoid1882

macroprism1883

semi-form1895

tetartohedron1895

tetrakisdodecahedron1895

trichite1900

1878 H. P. Gurney Crystallogr. 86 A four-faced cube, or more technically a tetrakishexahedron.

1887 Athenæum 10 Sept. 345/2 The new crystals are sharply defined cubes, of which some have the edges replaced by faces of the rhombic dodecahedron or of a tetrakishexahedron.

1895 N. Story-Maskelyne Crystallogr. vii. 195 The tetrakis-hexahedron..presents the aspect of a cube each face of which is surmounted by an obtuse pyramid, and it may, on this account, be termed the cube-pyramidion... The figure is a twenty-four-faced isoscelohedron.

This entry has not yet been fully updated (first published 1911; most recently modified version published online June 2019).

单词	tetrakis-hexahedron
释义	tetrakis-hexahedronn. Etymology: < Greek τετράκις four times + hexahedron n.Previous versions of the OED give the stress as: ˌtetrakis-hexaˈhedron. A solid figure contained by twenty-four equal triangular planes, having the appearance of a cube with a low pyramid raised on each of its six faces. (In Crystallography belonging to the isometric system.) In Geometry the name is specially applied to the figure when the pyramids are of such a height that all the adjacent faces are equally inclined to each other, so that the figure meets the sphere circumscribing the fundamental cube at fourteen points. Also called tetrahexahedron (b), cube-pyramidion, and fluoroid. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > specific crystal forms > [noun] tripyramid1828 trisoctahedron1837 fluoroid1850 sphenoid1855 discalenohedron1872 prism1878 tetrakis-hexahedron1878 galenoid1882 macroprism1883 semi-form1895 tetartohedron1895 tetrakisdodecahedron1895 trichite1900 1878 H. P. Gurney Crystallogr. 86 A four-faced cube, or more technically a tetrakishexahedron. 1887 Athenæum 10 Sept. 345/2 The new crystals are sharply defined cubes, of which some have the edges replaced by faces of the rhombic dodecahedron or of a tetrakishexahedron. 1895 N. Story-Maskelyne Crystallogr. vii. 195 The tetrakis-hexahedron..presents the aspect of a cube each face of which is surmounted by an obtuse pyramid, and it may, on this account, be termed the cube-pyramidion... The figure is a twenty-four-faced isoscelohedron. This entry has not yet been fully updated (first published 1911; most recently modified version published online June 2019). < n.1878
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