prismatoid

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

A term used by N. Story Maskelyne for a crystal form whose faces are parallel to one of the crystallographic axes while meeting the other two axes.

A solid having two parallel polygonal bases connected by triangular faces.

Any polyhedron whose vertices all lie in either of two parallel planes

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