Search Result for "prismatoid": 
Wordnet 3.0

NOUN (1)

1. 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; 



WordNet (r) 3.0 (2006):

prismatoid
    n 1: 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