dodecagon
noun /dəʊˈdekəɡən/
  /dəʊˈdekəɡən/
 (geometry)- a flat shape with twelve straight sides and twelve angles compare dodecahedronTopics Colours and Shapesc2Word Originlate 17th cent.: from Greek dōdekagōnon, neuter (used as a noun) of dōdekagōnos ‘twelve-angled’.