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[pol-ee-hee-druh n] /ˌpɒl iˈhi drən/
noun, plural polyhedrons, polyhedra
[pol-ee-hee-druh] /ˌpɒl iˈhi drə/ (Show IPA)
a solid figure having many faces.
Origin of polyhedron
1560-70; < Greek polýedron, neuter of polýedros having many bases. See poly-, -hedron Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for polyhedron


noun (pl) -drons, -dra (-drə)
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
Derived Forms
polyhedral, adjective
Word Origin
C16: from Greek poluedron, from poly- + hedron side, base
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for polyhedron

1560s, from Latinized form of Greek polyedron, neuter of adjective polyedros "having many bases or sides," from polys "many" (see poly-) + hedra "seat, base, chair, face of a geometric solid," from PIE root *sed- (1) "to sit" (see sedentary).

Online Etymology Dictionary, © 2010 Douglas Harper
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polyhedron in Science
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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