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tetrahedron 音標拼音: [t,ɛtrəh'idrən] n. 四面體 四面體 tetrahedron 四面體 tetrahedron n 1: any polyhedron having four plane faces Tetrahedron \Tet`ra*he"dron\, n. [Tetra- Gr. ? seat, base, fr.
? to sit.] (Geom.) A solid figure inclosed or bounded by four triangles. [1913 Webster] Note: In crystallography, the regular tetrahedron is regarded as the hemihedral form of the regular octahedron. [1913 Webster] {Regular tetrahedron} (Geom.), a solid bounded by four equal equilateral triangles; one of the five regular solids. [1913 Webster]
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