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A three-dimensional shape having twelve plane faces, in particular a regular solid figure with twelve equal pentagonal faces.
- ‘There is a fifth Platonic regular solid too: the dodecahedron, which has pentagonal (five-sided) faces.’
- ‘Dali also incorporated in the painting a huge dodecahedron (a twelve-faced Platonic solid in which each side is a pentagon) engulfing the supper table.’
- ‘The fifth regular polyhedron, the dodecahedron, was left over, so Plato proposed rather lamely that the god used it up for decorating the universe.’
- ‘Finally, so as not to leave out the one remaining regular solid, he proposed that the dodecahedron represented the shape of the entire universe.’
- ‘As well as constructions to divide a line in the golden ratio, Euclid gives applications such as the construction of a regular pentagon, an icosahedron and a dodecahedron.’
Late 16th century: from Greek dōdekaedron, neuter (used as a noun) of dōdekaedros ‘twelve-faced’.
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