octahedron :

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ok tuh heed ruhn

  • n  any polyhedron having eight plane faces

  • The stone was a "Cape yellow" weighing 511 carats, a nearly perfect octahedron and one of the biggest diamonds ever found in South Africa.
  • But Fuller insists that with this mast combined with his frame of tetrahedron-octahedron combinations which he calls the "octet truss," he could bridge the Grand Canyon itself.

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