polyhedron

• polyedron

From New Latin polyedron, from Ancient Greek πολύεδρος (polúedros, “having many seats”), from πολυ- (polu-, “many”) + ἕδρα (hédra, “seat”); compare French polyèdre. By surface analysis, poly- +‎ -hedron.

• (UK) IPA^(key): /ˌpɒlɪˈhiːdɹən/, /ˌpɒliːˈhiːdɹən/, /ˌpɒliːˈhiːdɹɒn/, (dated) /ˌpɒlɪˈhɛdɹən/, /ˌpɒliːˈhɛdɹən/, /ˌpɒliːˈhɛdɹɒn/

• Audio (UK):

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• (US) IPA^(key): /ˌpɑliˈhidɹən/, /ˌpɑliˈhidɹɑn/

• Audio (US):

  (file)

• Rhymes: -iːdɹən, -iːdɹɒn, -ɛdɹən, -ɛdɹɒn

polyhedron (plural polyhedra or polyhedrons)

1. (geometry) A solid figure with many flat faces and straight edges.
   • 1966, Norman W. Johnson, “Convex Polyhedra with Regular Faces”, in Canadian Journal of Mathematics, volume XVIII, number I, Toronto: University of Toronto Press, page 181:

     Of the convex polyhedra with regular faces, the only ones that have tetrahedral, octahedral, or icosahedral symmetry are the Platonic and Archimedean solids.

2. (optics) A polyscope, or multiplying glass.

• abstract polyhedron
• polytope

See also Thesaurus:polyhedron

• apeirohedron
• Schläfli symbol
• spherical polyhedron
• subpolyhedron
• tessellation