decagon
noun /ˈdekəɡən/
/ˈdekəɡɑːn/
(geometry- a flat shape with ten straight sides and ten angles
compare decahedronTopics Colours and Shapesc2十边形;十角形 词源mid 17th cent.: via medieval Latin from Greek dekagōnon, neuter (used as a noun) of dekagōnos ‘ten-angled’.