dodecagon


Concise Oxford English Dictionary © 2008 Oxford University Press:
dodecagon /dəʊˈdɛkəg(ə)n/
noun a plane figure with twelve straight sides and angles.
– origin C17: from Gk dōdekagōnon, neut. (used as a noun) of dōdekagōnos ‘twelve-angled’.
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