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 hemi·he·dral /ˌhɛmɪˈhidrəl/

 Hem·i·he·dral a.  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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