do·dec·a·gon
noun/dəʊˈdekəɡən/
/dəʊˈdekəɡən/
(geometry)- a flat shape with twelve straight sides and twelve angles
十二边形；十二角形 Word Originlate 17th cent.: from Greek dōdekagōnon, neuter (used as a noun) of dōdekagōnos ‘twelve-angled’.