undecagon

[ uhn-dek-uh-gon, -guhn ]
/ ʌnˈdɛk əˌgɒn, -gən /

noun

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 decemten) + decagon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for undecagon

undecagon
/ (ʌnˈdɛkəˌɡɒn) /

noun

a polygon having eleven sides

Word Origin for undecagon

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