T1R1I1S1O1C3T1A1H4E1D2R1O1N1
20 points
TRISOCTAHEDRON is validvalid
a polyhedron with 24 congruent triangular sides [n TRISOCTAHEDRA, TRISOCTAHEDRONS]
a solid figure having 24 congruent faces and an octahedron as a base [n TRISOCTAHEDRA or TRISOCTAHEDRONS]