What is "hendecahedron"

n. (context geometry English) A solid having eleven plane faces

A hendecahedron (or undecahedron) is a polyhedron with 11 faces. There are numerous topologically distinct forms of a hendecahedron, for example the decagonal pyramid, and enneagonal prism.

Three forms are Johnson solids: augmented hexagonal prism, biaugmented triangular prism, and elongated pentagonal pyramid.

Two classes, the bisymmetric and the sphenoid hendecahedra, are space-filling.