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Webster 1913 Edition

Noun.

[Gr. [GREEK] sevencornered;

ἑπτά

seven + [GREEK] angle: cf. F.

heptagone

(Geom.)

A plane figure consisting of seven sides and having seven angles.

Noun.

[Gr. seven, and an angle.]

In geometry, a figure consisting of seven sides and as many angles.

In fortification, a place that has seven bastions for defense.

See also: heptagon

heptàgon m ‎(plural heptàgons)