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Trigonal
Trigonal Trig"o*nal, a.
Having three angles, or corners; triangular; as, a trigonal
stem, one having tree prominent longitudinal angles.
Trigonal trisoctahedronTrisoctahedron 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 trapezohedron and
icositetrahedron.
Trigonal trisoctahedron, a trisoctahedron each face of
which is an isosceles triangle.
Meaning of Rigona from wikipedia