- 1. n. A solid figure inclosed or bounded by four triangles. Source: opted
- 2. n. any polyhedron having four plane faces Source: wordnet
- 3. 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. Source: webster
- 4. n:100 n. any polyhedron having four plane faces Source: ecdict
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tetrahedron
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regularboundedsolidtrianglesfacesfigureinclosedplanepolyhedroncrystallographyequalequilateralformhemihedralnoteoctahedronregardedsolids
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