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A prismatoid having polygons with the same number of sides as bases, and faces that are parallelograms or trapezoids.
pris·moi′dal (-moid′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.