'Heptagon' definitions:
Definition of 'heptagon'
From: WordNet
noun
A seven-sided polygon
Definition of 'Heptagon'
From: GCIDE
- Heptagon \Hep"ta*gon\, n. [Gr. ? sevencornered; "epta` seven + ? angle: cf. F. heptagone.] (Geom.) A plane figure consisting of seven sides and having seven angles. [1913 Webster]