We were asked to draw a pentahedron.    From LearnThat.org. 

Yes, he thought to himself as his eyes scanned the fascinating complex of structures, aver there is a dodecahedron, there a pentahedron.    From Wordnik.com.  [Rama Revisited]

In turn it was a sphere, a disk, a pyramid, a pentahedron, a polyhedron.    From Wordnik.com.  ["Where Angels Fear to Tread" and Other Stories of the Sea] Reference

“universe”, “prime number”; of the second kind are ideas like “nothing”, “round square”, “regular pentahedron”, “golden mountain” (empirically empty), logical particles such as.    From Wordnik.com.  [Bolzano's Logic] Reference