Webster’s Revised Unabridged Dictionary · 1913
Polyhedron
Pol′y·he′dron (·hē′drŏn), n.; pl. E. Polyhedrons. (#), L. Polyhedra (#). [NL., fr. Gr. πολύεδρος with many seats or sides; πολύς many + ἕδρα a seat or side: cf. F. polyèdre.] 1. (Geom.) A body or solid contained by many sides or planes.
2. (Opt.) A polyscope, or multiplying glass.