tetrahedron: see polyhedron polyhedron , closed solid bounded by plane faces; each face of a polyhedron is a polygon. A cube is a polyhedron bounded by six polygons (in this case squares) meeting at right angles.
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tetrahedron
tetrahedron [‚te·trə′hē·drən]
Tetrahedron
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tetrahedron
1. a solid figure having four plane faces. A regular tetrahedron has faces that are equilateral triangles
2. any object shaped like a tetrahedron
tetrahedron [‚te·trə′hē·drən]
(crystallography)
An isometric crystal form in cubic crystals, in the shape of a four-faced polyhedron, each face of which is a triangle.
(mathematics)
A four-sided polyhedron.
Tetrahedron
(or triangular pyramid), a polyhedron with four triangular faces, six edges, and four vertices. At each vertex three edges intersect. The regular tetrahedron (Figure 1) is one
Figure 1
of the five regular polyhedrons. If a is the length of an edge of a regular tetrahedron, the volume of the tetrahedron is 
.
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