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1. (adj.) hemihedral
(of a crystal) having only half the planes or faces required by the maximum symmetry of the system to which it belongs.
Etymology: (1830–40)
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| Definition of 'Hemihedral' |
Webster Dictionary |
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1. (adj) Hemihedral
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
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Definitions of Hemihedral 
