prismatoid

pris·ma·toid  (przm-toid)

n.

A polyhedron all of whose vertices lie in one of two parallel planes.

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[Greek prsma, prsmat-, prism + -oid.]

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prisma·toidal (-toidl) adj.

Thesaurus

Noun

1.

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 polyhedron - a solid figure bounded by plane polygons or faces prismoid - a prismatoid whose bases are polygons having the same number of sides and whose other faces are trapezoids or parallelograms