Enneahedron

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Enneahedria \En`ne*a*he"dri*a\, Enneahedron \En`ne*a*he"dron\,
     n. (Geom.)
     A figure having nine sides; a nonagon.
     [1913 Webster]