1560s, from Latinized form of Greek polyedron, neuter of adjective polyedros "having many bases or sides," from polys "many" (from PIE root *pele- (1) "to fill") + hedra "seat, base, chair, face of a geometric solid," from PIE root *sed- (1) "to sit."
polyglot
polygon
polygraph
polygyny
polyhedral
polyhedron
polyhistor
polymath
polymer
polymerase
polymeric