# polyhedra

## polyhedron

[pol-ee-hee-druhn]
noun, plural polyhedrons, polyhedra [pol-ee-hee-druh] .
a solid figure having many faces.

Origin:
1560–70; < Greek polýedron, neuter of polýedros having many bases. See poly-, -hedron

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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

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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