decagon
noun/ˈdekəɡən/
/ˈdekəɡɑːn/
(geometry)- a flat shape with ten straight sides and ten angles compare decahedronTopics Colours and Shapesc2Word Originmid 17th cent.: via medieval Latin from Greek dekagōnon, neuter (used as a noun) of dekagōnos ‘ten-angled’.
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decagon