duodecagon

[doo-uh-dek-uh-gon, -guh n, dyoo-] /ˌdu əˈdɛk əˌgɒn, -gən, ˌdyu-/

noun, Geometry.

dodecagon.

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Based on the Random House Dictionary, © Random House, Inc. 2016.
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Historical Examples

The majority are polygonal, the sides not necessarily of equal length, and few of them exceeding the duodecagon in number.

British Castles Charles H. Ashdown

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