decagon

[dek-uh-gon]
noun Geometry.
a polygon having ten angles and ten sides.

Origin:
1565–75; < Medieval Latin decagōnum. See deca-, -gon

decagonal [duh-kag-uh-nl] , adjective
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World English Dictionary
decagon (ˈdɛkəˌɡɒn)
 
n
a polygon having ten sides
 
decagonal
 
adj
 
de'cagonally
 
adv

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

decagon
early 17c., from M.L. decagonum, from Gk. dekagonon, from Gk. deka "ten" + gonia "corner, angle" (see knee).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
decagon   (děk'ə-gŏn')  Pronunciation Key 
A polygon having ten sides.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The diagonals of heptagon, nonagon, and decagon should be drawn directly onto the worksheet.
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