Sentence:  So, for instance, covering up the right-hand side of our example (as in Figure 20.2(a)), we see that the <WSD>rhombicuboctahedron</WSD> does indeed have three types of face: two four-sided ones and one three-sided one. 
Meaning of the word marked with <WSD> tags:  An Archimedean solid with eight triangular and eighteen square faces; the small rhombicuboctahedron.