from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A polyhedron all of whose vertices lie in one of two parallel planes.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any polyhedron whose vertices all lie in either of two parallel planes
from The Century Dictionary and Cyclopedia
- n. A solid having two parallel polygonal bases connected by triangular faces.
- n. 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.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. 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
Greek prīsma, prīsmat-, prism + -oid.(American Heritage® Dictionary of the English Language, Fourth Edition)