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Deltohedron

Source : Webster's Revised Unabridged Dictionary (1913)

Deltohedron \Del`to*he"dron\, n. [Gr. de`lta, the letter [Delta]
   + 'e`dra seat, base.] (Crystallog.)
   A solid bounded by twelve quadrilateral faces. It is a
   hemihedral form of the isometric system, allied to the
   tetrahedron.
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