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Platonic solid

noun, Geometry.
one of the five regular polyhedrons: tetrahedron, octahedron, hexahedron, icosahedron, or dodecahedron.
Origin of Platonic solid
First recorded in 1950-55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for Platonic solid

Platonic solid

any of the five possible regular polyhedra: cube, tetrahedron, octahedron, icosahedron, and dodecahedron Also called (esp formerly) Platonic body
Word Origin
C17: named after Plato1, who was the first to list them
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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