| tetrahedron | <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. <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. Source: Websters Dictionary (01 Mar 1998) |
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| asymmetry | 1. Want of symmetry, or proportion between the parts of a thing, especially. Want of bilateral symmetry. 2. <mathematics> Incommensurability. Origin: Gr.; priv. + symmetry. Source: Websters Dictionary (01 Mar 1998) |
| facial asymmetry | Congenital or acquired asymmetry of the face. (12 Dec 1998) |