Category:Tetrahedron

Tet`ra*he"dron, n. Etym: [tetra- + gr. (geom.)

Defn: 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.