n. (Crystallog.) A combination of a cube and octahedron, esp. one in which the octahedral faces meet at the middle of the cubic edges. [ 1913 Webster ]
n. [ Gr. 'okta`edron, fr. 'okta`edros eight-sided; 'okta- (for 'oktw` eight) + "e`dra seat, base, from "e`zesqai to sit. ] (Geom.) A solid bounded by eight faces. The regular octahedron is contained by eight equal equilateral triangles. [ 1913 Webster ]
n. [ Gr. &unr_; thrice + FE. octahedron. ] (Crystallog.) A solid of the isometric system bounded by twenty-four equal faces, three corresponding to each face of an octahedron. [ 1913 Webster ]
Tetragonal trisoctahedron, a trisoctahedron each face of which is a quadrilateral; called also trapezohedron and icositetrahedron. -- Trigonal trisoctahedron, a trisoctahedron each face of which is an isosceles triangle. [ 1913 Webster ]
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