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.
Tetragonal trisoctahedron, a trisoctahedron each face of which is a quadrilateral; called also
Trigonal trisoctahedron, a trisoctahedron each face of which is an isosceles triangle.
Tri*spas"ton(?), } n. [NL. trispaston, fr. Gr. drawn threefold; (see Tri-) + to draw.] (Mech.) A machine with three pulleys which act together for raising great weights. Brande & C.
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