octahedron Meaning, Definition & Usage

  1. noun any polyhedron having eight plane faces

WordNet

Oc`ta*he"dron noun
Etymology
Gr., fr. eight-side; (for eight) + seat, base, from to sit.
Definitions
  1. (Geom.) A solid bounded by eight faces. The regular octahedron is contained by eight equal equilateral triangles.

Webster 1913