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From The Collaborative International Dictionary of English v.0.48:
octahedron \oc`ta*he"dron\ ([o^]k`t[.a]*h[=e]"dr[o^]n), n. [Gr. 'okta`edron, fr. 'okta`edros eight-sided; 'okta- (for 'oktw` eight) + "e`dra seat, base, from "e`zesqai to sit.] (Geom.) A solid bounded by eight faces. The regular octahedron is contained by eight equal equilateral triangles. [1913 Webster]