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prismoidal

[priz-moid]

noun Geometry.

a solid having sides that are trapezoids and bases or ends that are parallel and similar but not congruent polygons. Compare prism (def. 2).

Origin:
1695–1705; prism + -oid

Related forms

pris·moi·dal, adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Prismoidal is always a great word to know.

So is callithumpian. Does it mean:

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

a gadget; dingus; thingumbob.

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Collins

World English Dictionary

prismoid (ˈprɪzmɔɪd)

—n
	a prismatoid having an equal number of vertices in each of the two parallel planes and whose sides are trapeziums or parallelograms

[C18: from French prismoïde; see prism, -oid]

pris'moidal

—*adj*

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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prismoidal

pris·moid