2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: 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] From WordNet (r) 2.0 [wn]: tetrahedron n : any polyhedron having four plane faces [also: {tetrahedra} (pl)]
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