| hemihedral | <chemistry> Having half of the similar parts of a crystals, instead of all; consisting of half the planes which full symmetry would require, as when a cube has planes only on half of its eight solid angles, or one plane out of a pair on each of its edges; or as in the case of a tetrahedron, which is hemihedral to an octahedron, it being contained under four of the planes of an octahedron. Hemihe"drally. Origin: Hemi- + Gr. Seat, base, fr. To sit. Source: Websters Dictionary (01 Mar 1998) |
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