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(), n.[Tetra- + Gr. seat, base, fr. to sit.] (Geom.) A solid figure inclosed or bounded by four triangles. In crystallography, the regular tetrahedron is regarded as the hemihedral form of the regular octahedron. Regular tetrahedron (Geom.), a solid bounded by four equal equilateral triangles; one of the five regular solids. スポンサード リンク
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