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nonagon

[non-uh-gon, -guh n] /ˈnɒn əˌgɒn, -gən/
noun
1.
a polygon having nine angles and nine sides.
Also called enneagon.
Origin
1680-1690
1680-90; < Latin nōn(us) ninth + -a- (extracted from pentagon, hexagon, etc.) + -gon
Related forms
nonagonal
[non-ag-uh-nl] /nɒnˈæg ə nl/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for nonagon
  • The diagonals of heptagon, nonagon, and decagon should be drawn directly onto the worksheet.
British Dictionary definitions for nonagon

nonagon

/ˈnɒnəˌɡɒn/
noun
1.
a polygon having nine sides Also called enneagon
Derived Forms
nonagonal (nɒnˈæɡənəl) adjective
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 nonagon
n.

"plane figure with nine sides," 1680s, a hybrid from Latin nonus "ninth" (see nones) + ending from pentagon, etc.

Online Etymology Dictionary, © 2010 Douglas Harper
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Word Value for nonagon

8
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