Hypertext Webster Gateway: "Heptagon"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
From WordNet (r) 1.7 (wn)
heptagon
n : a seven-sided polygon
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