Trisoctahedron
Pronunciation : Tris*oc`ta*he"dron
Part of Speech : n.
Etymology : [Gr. octahedron.] (Crystallog.)
Definition : Defn: A solid of the isometric system bounded by twenty-four equal faces, three corresponding to each face of an octahedron. 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.
Source : Webster's Unabridged Dictionary, 1913