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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 of nonagon
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. 2015.
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Examples from the Web for nonagon
Historical Examples
  • There is said to be only one triangle, only one nonagon, and only one of diamond shape in all the forty thousand.

    One Irish Summer William Eleroy Curtis
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
12
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