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enneagon [enneagons]▼(a polygon with nine sides; a nonagon)noun[UK: enˈiːɡən] [US: enˈiːɡɑːn]
nonagon [nonagons]▼(A polygon with nine sides and nine angles)noun[UK: nˌɒnˈaɡɒn] [US: nˌɑːnˈæɡɑːn]
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