
• (a.) 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 u...
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http://thinkexist.com/dictionary/meaning/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 conta...
Found on
http://www.encyclo.co.uk/local/20973
Hem`i·he'dral adjective [
Hemi- + Greek ... seat, base, from ... 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, ...
Found on
http://www.encyclo.co.uk/webster/H/31
No exact match found.