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decagon

[dek-uh-gon, -guh n] /ˈdɛk əˌgɒn, -gən/
noun, Geometry
1.
a polygon having ten angles and ten sides.
Origin
1565-1575
1565-75; < Medieval Latin decagōnum. See deca-, -gon
Related forms
decagonal
[duh-kag-uh-nl] /dəˈkæg ə nl/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for decagonal

decagon

/ˈdɛkəˌɡɒn/
noun
1.
a polygon having ten sides
Derived Forms
decagonal (dɪˈkæɡənəl) adjective
decagonally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for decagonal
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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decagonal in Science
decagon
  (děk'ə-gŏn')   
A polygon having ten sides.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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