enneahedron

plural enneahedra · plural enneahedrons

1. geometryA polyhedron with nine faces.

   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].

   2 more examples

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

   1968, Design, numbers 229-234, unnumbered page

   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.

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

   Synonyms: nonahedron