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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]

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