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

[Greek prīsma, prīsmat-, prism + -oid.]

pris′ma·toi′dal (-toid′l) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Mathematics) a polyhedron whose vertices lie in either one of two parallel planes. Compare prism3, prismoid
[C19: from Greek prismatoeidēs shaped like a prism; see prism, -oid]
ˌprismaˈtoidal adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈprɪz məˌtɔɪd)

a polyhedron having its vertices lying on two parallel planes.
[1855–60; < Greek prīsmat- (s. of prîsma) prism]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The volume of the PVA plot was calculated by determining the volumes of the prismatoid and the underlying rectangle under the cost surface for each unit square indicated on the x-axis and y-axis of the PVA plot.