Definitions for: Tetrahedron

[n] any polyhedron having four plane faces

Webster (1913) Definition: Tet`ra*he"dron, n. [Tetra- + Gr. ? seat, base, fr.
? to sit.] (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.

See Also: polyhedron

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