duodecagon
[doo-uh-dek-uh-gon, -guh n, dyoo-]
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for duodecagon
Historical Examples
The majority are polygonal, the sides not necessarily of equal length, and few of them exceeding the duodecagon in number.
British CastlesCharles H. Ashdown