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prismatoid

[priz-muh-toid] /ˈprɪz məˌtɔɪd/
noun, Geometry
1.
a polyhedron having its vertices lying on two parallel planes.
Origin
1855-1860
1855-60; < Greek prīsmat- (stem of prîsma) prism + -oid
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for prismatoid

prismatoid

/ˈprɪzməˌtɔɪd/
noun
1.
a polyhedron whose vertices lie in either one of two parallel planes Compare prism (sense 3), prismoid
Derived Forms
prismatoidal, adjective
Word Origin
C19: from Greek prismatoeidēs shaped like a prism; see prism, -oid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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