pentagonal hexecontahedron noun1 •A Catalan solid with 60 irregular pentagonal faces, 150 edges and 92 vertices, being the dual of the snub dodecahedron.Fig. 11b shows the three sub-implosions-- face-to-vertex, face-to-edge, face-to-face-- to give the dual pentagonal hexecontahedron. Full implosion consists of these three together. — 1976 formspentagonal hexecontahedra