nounplural noun polyhedrons, plural noun polyhedra/-ˈhēdrə/

• A solid figure with many plane faces, typically more than six.

  ‘Plato believed that atoms have the shapes of regular polyhedra: cubes, tetrahedrons, octahedrons, and so on.’

  More example sentences

  • ‘Kepler connected the planetary orbits with the five regular polyhedra, or Platonic solids.’
  • ‘The icosahedron is one of only five regular convex polyhedrons, the symmetric ‘Platonic solids’ that fascinated the ancient Greeks (the cube is another).’
  • ‘For example, fair dice don't have to be in the shape of regular polyhedra, such as cubes, icosahedra, and so on.’
  • ‘He submitted his first paper on this topic then, encouraged by Legendre and Malus, he submitted a further paper on polygons and polyhedra in 1812.’