prismatoid
Noun

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 (synset 113940907)hypernym: polyhedron  a solid figure bounded by plane polygons or faceshyponym: prismoid  a prismatoid whose bases are polygons having the same number of sides and whose other faces are trapezoids or parallelograms
Other Searches
 Rhyme: Dillfrog, RhymeZone
 Definition: Wiktionary, Dictionary.com, Wikipedia, MerriamWebster, WordNet
 Imagery: Google, Flickr, Bing