A polyhedron with 24 faces and 36 edges. Usually each face is a triangle.
It looks like four pyramids (pentahedrons) with the bases placed together to form a cube in the center.

Tet`ra*hex`a*he"dron (?), n. [Tetra- + hexahedron.] Crystallog.

A solid in the isometric system, bounded by twenty-four equal triangular faces, four corresponding to each face of the cube.

 

© Webster 1913.

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