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polyhedron

 [pol-ee-hee-druhn]   Origin

pol·y·he·dron

   [pol-ee-hee-druhn]
noun, plural pol·y·he·drons, pol·y·he·dra  [-druh] .
a solid figure having many faces.
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Origin:
1560–70; < Greek polýedron, neuter of polýedros having many bases. See poly-, -hedron
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Polyhedron is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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Collins
World English Dictionary
polyhedron (ˌpɒlɪˈhiːdrən)
 
—n , pl -drons, -dra
a solid figure consisting of four or more plane faces (all polygons), pairs of which meet along an edge, three or more edges meeting at a vertex. In a regular polyhedron all the faces are identical regular polygons making equal angles with each other. Specific polyhedrons are named according to the number of faces, such as tetrahedron, icosahedron, etc
 
[C16: from Greek poluedron, from poly- + hedron side, base]
 
poly'hedral
 
—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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Etymonline
Word Origin & History

polyhedron
1570, from Gk. polyedron, neut. of adj. polyedros "having many bases or sides," from polys "many" (see poly-) + hedra "seat, base, chair, face of a geometric solid," from PIE base *sed- "to sit" (see sedentary).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
polyhedron   (pŏl'ē-hē'drən)  Pronunciation Key 
Plural polyhedrons or polyhedra
A three-dimensional geometric figure whose sides are polygons. A tetrahedron, for example, is a polyhedron having four triangular sides. ◇ A regular polyhedron is a polyhedron whose faces are all congruent regular polygons. The regular tetrahedron (pyramid), hexahedron (cube), octahedron, dodecahedron, and icosahedron are the five regular polyhedrons. Regular polyhedrons are a type of Archimedean solid.

polyhedral adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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