Definition:Enneahedron

Definition

A enneahedron is a polyhedron which has $9$ faces.

Linguistic Note

The word enneahedron derives from the Classical Greek δεκαεδρόν:

ennea (ἐννέα), meaning nine

hedron (a form of ἕδρα), meaning base or seat.

The technically correct plural of enneahedron is enneahedra, but the word enneahedrons can often be found.