Definition of pentahedron in English:

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pentahedron

Pronunciation: /ˌpɛntəˈhiːdr(ə)n/

noun (plural pentahedra /ˌpɛntəˈhiːdrə/ or pentahedrons)

A solid figure with five plane faces.
Example sentences
  • 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.
  • 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.

Derivatives

pentahedral

adjective
Example sentences
  • There are two topologically distinct pentahedral graphs which, through duality, correspond to the skeletons of the square pyramid and triangular dipyramid.
  • I noticed that it was closely related to the pentahedral prism packing.

Origin

Late 18th century: from penta- 'five' + -hedron, on the pattern of words such as polyhedron.

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