Noun | 1. | ![]() polyhedron - a solid figure bounded by plane polygons or faces regular tetrahedron - a tetrahedron with four equilateral triangular faces cube, regular hexahedron - a hexahedron with six equal squares as faces regular dodecahedron - a dodecahedron with twelve regular pentagons as faces regular octahedron - an octahedron with eight equilateral triangles as faces regular icosahedron - an icosahedron with twenty equilateral triangles as faces |