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tetrahedron

(Science: geometry) A solid figure inclosed or bounded by four triangles.

In crystallography, the regular tetrahedron is regarded as the hemihedral form of the regular octahedron.

(Science: geometry) regular tetrahedron, a solid bounded by four equal equilateral triangles; one of the five regular solids.

Origin: Tetra- _ Gr. Seat, base, fr. To sit.