MATHEMATICS A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site octahedron A polyhedron with 8 faces, each of which is an equilateral triangle. A regular octahedron, whose sides are all equilateral triangles, is one of the Platonic solids; it looks like two square pyramids with their square bases stuck together. Related category    • MATHEMATICS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP