From The Collaborative International Dictionary of English v.0.44 [gcide]:
Prismoid \Pris"moid\ (pr[i^]z"moid), noun [Cf. F. prismto["i]de.] A body that approaches to the form of a prism.
From WordNet (r) 2.0 [wn]:
noun
1: a prismatoid whose bases are polygons having the same number of sides and whose other faces are trapezoids or parallelograms
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