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prismatoid

American  
[priz-muh-toid] / ˈprɪz məˌtɔɪd /

noun

Geometry.

  1. a polyhedron having its vertices lying on two parallel planes.

prismatoid British  
/ ˈprɪzməˌtɔɪd /

noun

  1. a polyhedron whose vertices lie in either one of two parallel planes Compare prism prismoid

"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

Other Word Forms

  • prismatoidal adjective

Etymology

Origin of prismatoid

1855–60; < Greek prīsmat- (stem of prîsma ) prism + -oid

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.