#prismatoid  a polyhedron whose vertices all lie in one or the other of two parallel planes; the faces that lie in those planes are the bases of the prismatoid
  supertype:  #polyhedron  a solid figure bounded by plane polygons or faces
  subtype:  #prismoid  a prismatoid whose bases are polygons having the same number of sides and whose other faces are trapezoids or parallelograms

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