Noun
Archimedean solid (plural Archimedean solids)
(geometry) Any of a class of convex semiregular polyhedra, composed of two or more types of regular polygon meeting in identical vertices.
Also, in part due to self-duality of the tetrahedron, only one Archimedean solid has only tetrahedral symmetry. Source: Internet
It is dual to the quasiregular cuboctahedron (an Archimedean solid ) and occurs in nature as a crystal form. Source: Internet