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.
   • 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.

   Synonym: duodecahedron

•   dodecahedron on Wikipedia.Wikipedia