'Pentahedron' definitions:

Definition of 'pentahedron'

(from WordNet)
noun
Any polyhedron having five plane faces

Definition of 'Pentahedron'

From: GCIDE
  • Pentahedron \Pen`ta*he"dron\, n. [Penta- + Gr. "e`dra seat, base.] A solid figure having five sides. [1913 Webster]