Definition:Semiregular Polyhedron

Definition
A semiregular polyhedron is a polyhedron with the following properties:
 * $(1): \quad$ Each of its faces is a regular polygon
 * $(2): \quad$ It is isogonal
 * $(3): \quad$ The faces are not all congruent.

Also see

 * Definition:Regular Polyhedron
 * Definition:Archimedean Polyhedron