[uhn-dek-uh-gon, -guh n]
- a polygon having 11 angles and 11 sides.
Origin of undecagon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a polygon having eleven sides
C18: from Latin undecim eleven (from unus one + decem ten) + -gon