non·a·gon

[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

non·ag·o·nal [non-ag-uh-nl] , adjective
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World English Dictionary
nonagon (ˈnɒnəˌɡɒn) [Click for IPA pronunciation guide]
 
n
Also called: enneagon a polygon having nine sides
 
nonagonal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Nonagon is always a great word to know.
So is quincunx. Does it mean:
a gadget; dingus; thingumbob.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Example sentences
The diagonals of heptagon, nonagon, and decagon should be drawn directly onto the worksheet.
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