Definition: pentahedron

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Source: WordNet (r) 1.7 

pentahedron
     n : any polyhedron having five plane faces

Source: Webster's Revised Unabridged Dictionary (1913) 

Pentahedron \Pen`ta*he"dron\, n. [Penta- + Gr. "e`dra seat,
   base.]
   A solid figure having five sides.