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undecagon

[uhn-dek-uh-gon, -guh n] /ʌnˈdɛk əˌgɒn, -gən/
noun
1.
a polygon having 11 angles and 11 sides.
Origin
1720-1730
1720-30; < Latin un-, as in undecim eleven (ūn(us) one + -decim, combining form of decem ten) + decagon
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for undecagon

undecagon

/ʌnˈdɛkəˌɡɒn/
noun
1.
a polygon having eleven sides
Word Origin
C18: from Latin undecim eleven (from unus one + decem ten) + -gon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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