Etymology
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polyhedron (n.)

"a solid bounded by many (usually more than 6) plane faces," 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").

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Definitions of polyhedron

polyhedron (n.)
a solid figure bounded by plane polygons or faces;
From wordnet.princeton.edu