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prismatoid

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pris⋅ma⋅toid

[priz-muh-toid]
–noun Geometry.
a polyhedron having its vertices lying on two parallel planes.

Origin:
1855–60; < Gk prīsmat- (s. of prîsma) prism + -oid
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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pris·ma·toid   (prĭz'mə-toid')   
n.  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.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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