2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Icositetrahedron \I`co*si*tet`ra*he"dron\, n. [Gr. ? twenty + ?, combining form of ? four + ? seat, base.] (Crystallog.) A twenty-four-sided solid; a tetragonal trisoctahedron or trapezohedron. [1913 Webster] From The Collaborative International Dictionary of English v.0.48 [gcide]: Trisoctahedron \Tris*oc`ta*he"dron\, n. [Gr. ? 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] Trispast
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