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trapezohedron 偏方三八面體 偏方三八面體 trapezohedron n 1: a polyhedron whose faces are trapeziums Trapezohedron \Trap`e*zo*he"dron\, n. [NL., from trapezium Gr.
? seat, base, fr. ? to sit.] (Crystalloq.) (a) A solid bounded by twenty-four equal and similar trapeziums; a tetragonal trisoctahedron. See the Note under {Trisoctahedron}. (b) A tetartohedral solid of the hexagonal system, bounded by six trapezoidal planes. The faces of this form are common on quartz crystals. [1913 Webster] Trisoctahedron \Tris*oc`ta*he"dron\, n. [Gr. ? thrice FE. octahedron.] (Crystallog.) A solid of the isometric system bounded by twenty-four equal faces, three corresponding to each face of an octahedron. [1913 Webster] {Tetragonal trisoctahedron}, a trisoctahedron each face of which is a quadrilateral; called also {trapezohedron} and {icositetrahedron}. {Trigonal trisoctahedron}, a trisoctahedron each face of which is an isosceles triangle. [1913 Webster] Trispast
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