1. 
   Heptahedron
   A heptahedron (plural: heptahedra) is a polyhedron having seven sides, or faces. A heptahedron can take a surprising number of different basic forms, or topologies. Probably most familiar are the hexagonal pyramid and the pentagonal prism. Also notable is the tetrahemihexahedron, whose seven equila...
   Found op http://en.wikipedia.org/wiki/Heptahedron
   
   
2. 
   Heptahedron
   Hep`ta·he'dron noun [ Hepta- + Greek ... seat, base, from ... to sit: confer French heptaèdre .] (Geom.) A solid figure with seven sides.
   Found op http://www.encyclo.co.uk/webster/H/34
   
   
3. 
   heptahedron
   <geometry> A solid figure with seven sides. ... Origin: Hepta- + Gr. Seat, base, fr. To sit: cf. F. Heptaedre. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?heptahedron
   
   
4. 
   Heptahedron
   • (n.) A solid figure with seven sides.
   Found op http://thinkexist.com/dictionary/meaning/heptahedron/
   
   

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