nounplural noun pentahedra/ˌpɛntəˈhiːdrə/ , plural noun pentahedrons

• A solid figure with five plane faces.

  ‘Whereas the tetrahedron is composed of four triangles, the pyramid (or pentahedron), which looks a lot like it, is composed of four triangles and a square - the base.’

  More example sentences

  • ‘You can also have an Egyptian pentahedron square-base pyramid.’
  • ‘Then the pyramids are cut by silhouettes into a set of pentahedrons, which together constitute the centripetal pentahedron model of the visual hull.’