| 单词 | triakisicosahedron |
| 释义 | > as lemmasˌtriakisˌicosaˈhedron representing Greek τριάκις thrice; used in combination in Geometry and Crystallography in ˌtriakisˌicosaˈhedron, triakisoctahedron, ˌtriakisˌtetraˈhedron (plural in all cases -hedra) names of solids derived respectively from the icosahedron, octahedron, and tetrahedron by erecting a triangular pyramid on each face, thus multiplying the original number of faces by three. (In Geometry specially applied to those forms in which the pyramids are of such altitude as to make all the solid angles regular.) Hence in derived adjectives, as ˌtriakisˌoctaˈhedrid. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > formed by converting faces to pyramids triakistetrahedron1878 the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > having number of faces > having twenty-four faces tetrahexahedral1816 triakisoctahedrid1878 trisoctahedral1891 1878 H. P. Gurney Crystallogr. 89 The form..called the triakisoctahedron. 1895 N. Story-Maskelyne Crystallogr. vii. §174. 199 The triakisoctahedron or octahedrid pyramidion..the more acute the pyramidion the more nearly it approximates in aspect to a rhomb-dodecahedron. 1895 N. Story-Maskelyne Crystallogr. vii. §187. 220 Triakisoctahedrid forms met with in combination. 1895 N. Story-Maskelyne Crystallogr. vii. §189. 224 The triakistetrahedra..(tetrahedrid pyramidia). < as lemmas |
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