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English

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Etymology

From octadeca- +‎ -hedron.

Pronunciation

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Noun

octadecahedron (plural octadecahedra or octadecahedrons)

  1. (geometry) A polyhedron with eighteen faces.
    • 1974, International Polymer Science and Technology, page 202:
      The cell structure was considered to consist of spherical holes but for the purposes of calculation, the cells were assumed to be octadecahedra. ln this model, a compressive force along the principal axis of the octadecahedron and parallel to.
    • 1986, Dick Alan Nagaki, page 20:
      In fact the structure of 2 can be related to the octadecahedron and the pentacapped trigonal prism in an interesting fashion

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