un decagon

undecagon

[uhn-dek-uh-gon]
noun
a polygon having 11 angles and 11 sides.

Origin:
1720–30; < Latin un-, as in undecim eleven (ūn(us) one + -decim, combining form of decem ten) + decagon

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World English Dictionary
undecagon (ʌnˈdɛkəˌɡɒn)
 
n
a polygon having eleven sides
 
[C18: from Latin undecim eleven (from unus one + decem ten) + -gon]

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