Wiktionary
pentahedrons
n. (plural of pentahedron English)
Usage examples of "pentahedrons".
The Sphere would willingly have continued his lessons by indoctrinating me in the conformation of all regular Solids, Cylinders, Cones, Pyramids, Pentahedrons, Hexahedrons, Dodecahedrons, and Spheres: but I ventured to interrupt him.