nonagon

[non-uh-gon]
noun
a polygon having nine angles and nine sides.
Also called enneagon.


Origin:
1680–90; < Latin nōn(us) ninth + -a- (extracted from pentagon, hexagon, etc.) + -gon

nonagonal [non-ag-uh-nl] , adjective
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World English Dictionary
nonagon (ˈnɒnəˌɡɒn)
 
n
Also called: enneagon a polygon having nine sides
 
nonagonal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The diagonals of heptagon, nonagon, and decagon should be drawn directly onto the worksheet.
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