nonagon

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non·a·gon

 (nŏn′ə-gŏn′, nō′nə-)
n.
A polygon with nine sides and nine angles.

nonagon

(ˈnɒnəˌɡɒn)
n
(Mathematics) a polygon having nine sides. Also called: enneagon
nonagonal adj

non•a•gon

(ˈnɒn əˌgɒn)

n.
a polygon having nine angles and nine sides.
[1680–90; < Latin nōn(us) ninth + -a- (extracted from pentagon, hexagon, etc.) + -gon]
non•ag′o•nal (-ˈæg ə nl) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.nonagon - a nine-sided polygonnonagon - a nine-sided polygon      
polygon, polygonal shape - a closed plane figure bounded by straight sides
Translations

nonagon

nNeuneck nt, → Nonagon nt

nonagon

[ˈnɒnəgɒn] nnonagono
References in periodicals archive ?
Students found trapezoids, diamonds, pentagons, hexagons, octagons, nonagons, decagons, dodecagons, and stars without prompts other than "Find other polygons.
The general format used in this activity could easily be extended to an exploration of regular polygons for which students are not likely to have concrete manipulatives, such as heptagons, nonagons, decagons, and dodecagons.
Since (23) can not be factored, there is no ruler-compass construction for the regular nonagon.