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 vertex-transitive
 * $(3): \quad$ The faces are not all congruent.

Also known as
Many sources present this as semi-regular, but prefers the simplicity of the unhyphenated version of this term.

Also see

 * Definition:Regular Polyhedron