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dodecagon

[doh-dek-uh-gon, -guh n]
noun Geometry.
  1. a polygon having 12 angles and 12 sides.
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Origin of dodecagon

First recorded in 1650–60; dodeca- + -gon
Related formsdo·de·cag·o·nal [doh-de-kag-uh-nl] /ˌdoʊ dɛˈkæg ə nl/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for dodecagon

dodecagon

noun
  1. a polygon having twelve sides
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Derived Formsdodecagonal (ˌdəʊdɛˈkæɡənəl), adjective
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