enneahedron

English

An elongated triangular bipyramid, an example of an enneahedron

A heptagonal prism, another enneahedron

Etymology

From ennea- +‎ -hedron.

Noun

enneahedron (plural enneahedrons or enneahedra)

1. (geometry) A polyhedron with nine faces.
   • 1968, Design, numbers 229-234, unnumbered page:

     The enneahedron is a simple all-space filler discovered by myself, based on the cubic antiprism, again omitted by Wood.

   • 1996, Michael O'Keeffe, Bruce G. Hyde, Crystal Structures, Number 1: Patterns & Symmetry, page 350,

     This is based on a packing of 36-vertex icosahedra [5¹².6⁸] and enneahedra (4³.5⁶].

   • 2015, Claudi Alsina, Roger B. Nelsen, A Mathematical Space Odyssey: Solid Geometry in the 21st Century, page 191:

     In Figure 9.10.3 we see a projection of the skeleton of an enneahedron (a solid with nine faces). All the faces of this enneahedron are quadrilaterals.

Synonyms

• nonahedron

Related terms

• enneagon
• enneahedral

Translations

Translations

• Chinese:

  Mandarin: 九面體／九面体 (zh) (jiǔmiàntǐ)

• Esperanto: naŭedro
• Finnish: yhdeksäntahokas
• French: please add this translation if you can
• German: Neunflächner m
• Italian: please add this translation if you can
• Japanese: 九面体 (kyūmentai)
• Korean: 구면체 (gumyeonche)
• Polish: dziewięciobok m
• Russian: девятигранник (ru) m (devjatigrannik)
• Tagalog: samdayag
• Ukrainian: дев'ятигранник m (devʺjatyhrannyk)

Further reading

• enneahedron on Wikipedia.Wikipedia