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plural dodecahedra or dodecahedrons
(geometry) A polyhedron with twelve faces; the regular dodecahedron has regular pentagons as faces and is one of the Platonic solids. quotations examples
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.
1707, Thomas Blount, Glossographia Anglicana Nova: Or, A Dictionary, Interpreting Such Hard Words, D. Brown, heading DO–DO