nonagon

from WordNet (r) 3.0 (2006)
nonagon
    n 1: a nine-sided polygon
from The Collaborative International Dictionary of English v.0.48
Nonagon \Non"a*gon\, n. [L. nonus ninth + Gr. ? angle.] (Math.)
   A plane figure or polygon having nine sides and nine angles.
   [1913 Webster]
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