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/rˈɛgjələr tˌɛtrəhˈidrən/ Listen  noun Tetrahedron n. (Geom.) A solid figure inclosed or bounded by four triangles. Note: 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.
Collaborative International Dictionary of English 0.48
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