a figure, especially a closed plane figure, having three or more, usually straight, sides.

1560–70; < Latin polygōnum < Greek polýgōnon, noun use of neuter of polýgōnos many-angled. See poly-, -gon

polygonal [puh-lig-uh-nl] , adjective
polygonally, adverb
subpolygonal, adjective
subpolygonally, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
polygon (ˈpɒlɪˌɡɒn)
a closed plane figure bounded by three or more straight sides that meet in pairs in the same number of vertices, and do not intersect other than at these vertices. The sum of the interior angles is (n--2) × 180° for n sides; the sum of the exterior angles is 360°. A regular polygon has all its sides and angles equal. Specific polygons are named according to the number of sides, such as triangle, pentagon, etc
[C16: via Latin from Greek polugōnon figure with many angles]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1571, from L. polygonum, from Gk. polygon "polygon," from neut. of polygonos "many-angled," from polys "many" + gonia "angle" (see knee).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
polygon   (pŏl'ē-gŏn')  Pronunciation Key 
A closed plane figure having three or more sides. Triangles, rectangles, and octagons are all examples of polygons. ◇ A regular polygon is a polygon all of whose sides are the same length and all of whose interior angles are the same measure.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

polygon definition

In geometry, a closed figure having three or more sides and lying on one plane.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The sheeting of collectors would be mounted on a polygon frame so the fluted
  collector is in plan-view triangular supported.
Fittingly, the basement space is shaped like a jagged polygon.
In the center we have a heptagon, that is to say a seven sided polygon.
To maximize the area of a polygon of a given perimeter is to equalize its sides
  as far as possible.
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