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prismatoid

[priz-muh-toid]
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noun Geometry.
  1. a polyhedron having its vertices lying on two parallel planes.
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Origin of prismatoid

1855–60; < Greek prīsmat- (stem of prîsma) prism + -oid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for prismatoid

prismatoid

noun
  1. a polyhedron whose vertices lie in either one of two parallel planesCompare prism (def. 3), prismoid
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Derived Formsprismatoidal, 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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012