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undecagon

[uhn-dek-uh-gon, -guh n]
noun
  1. a polygon having 11 angles and 11 sides.
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Origin of undecagon

1720–30; < Latin un-, as in undecim eleven (ūn(us) one + -decim, combining form of decem ten) + decagon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for undecagon

undecagon

noun
  1. a polygon having eleven sides
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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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012