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hemihedral |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Hemihedral \Hem`i*he"dral\, a. [Hemi- + Gr ? seat, base, fr ? to sit.] (Crystallog.) 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. -- {Hem`i*he"dral*ly}, adv
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