dodecahedron

From Ancient Greek δωδεκάεδρον (dōdekáedron). Equivalent to dodeca- +‎ -hedron.

• (UK) IPA^(key): /ˌdəʊ.dɛk.əˈhiː.dɹən/, /ˌdəʊ.dɪk.əˈhiː.dɹən/
• (US) IPA^(key): /ˌdoʊ.dɛk.əˈhiː.dɹən/, /doʊˌdɛk.əˈhiː.dɹən/

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dodecahedron (plural dodecahedra or dodecahedrons)

1. (geometry) A polyhedron with twelve faces; the regular dodecahedron has regular pentagons as faces and is one of the Platonic solids.

   Synonym: duodecahedron

   • 1707, Thomas Blount, Glossographia Anglicana Nova: Or, A Dictionary, Interpreting Such Hard Words, D. Brown, heading DO–DO,

     Dodecahedron, (Gr.) in Geometry, is a solid Figure of 12 Sides or Faces that are regular Pentagons, it is one of the Platonick or Regular Bodies.

   • 2015 March 17, Diana Lutz, quoting Ivan Horozov, “Researcher builds four-dimensional figure in his office”, in Phys.org‎^[1], archived from the original on 31 August 2025:

     It took me two years, but by the time I was 12 I could imagine the fifth four-dimensional polytope, which is made up of 120 dodecahedrons.

   • 2024 May 9, Samantha Tipper, “Why Did Ancient Romans Make this Baffling Metal Dodecahedron?”, in Scientific American‎^[2], New York, N.Y.: Springer Nature America, Inc., →ISSN, →OCLC, archived from the original on 9 May 2024:

     There is no uniformity in the size or shape of the dodecahedra found so far, nor in their metal composition or even in the level of craftsmanship. If they were important objects, we would expect to also discover contextual evidence in the archaeological record, such as depictions in paintings or mosaics.

• dodecahedron on Wikipedia.Wikipedia