n.
Pronunciation: ' hep-t ə - ˌ gän
Function: noun
Etymology: Greek heptag ō nos heptagonal, from hepta + g ō nia angle ― more at -GON
Date: 1570
: a polygon of seven angles and seven sides
– hep · tag · o · nal \ hep- ' ta-g ə -n ə l \ adjective
heptagon