Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A polygon having seven sides.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A polygon with seven sides and seven angles.

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

  • n. In geometry, a closed figure having seven angles successively united by lines.
  • n. In fort, a place that has seven bastions for defense.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a seven-sided polygon

Etymologies

Latin heptagōnon, from Greek heptagōnos, having seven angles : hepta-, hepta- + -gōnos, angled; see -gon.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Since 16th century, from Ancient Greek ἑπτάγωνον (heptagonon), from ἑπτά (hepta, "seven") + γωνία (gonia, "angle"). (Wiktionary)

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