[ dəʊ'dɛkəg(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'.
DODECAGON
Meaning of DODECAGON in English
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004