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[hep-tuh-gon, -guh n]
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  1. a polygon having seven angles and seven sides.

Origin of heptagon

First recorded in 1560–70, heptagon is from the Greek word heptágōnos seven-cornered. See hepta-, -gon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for heptagon

Historical Examples

  • Any child can make a heptagon at once, notwithstanding Mr. Abbott calls it so difficult.

    The Atlantic Monthly, Volume 5, No. 28, February, 1860


  • Heptagon, hep′ta-gon, n. a plane figure with seven angles and seven sides.

  • In the power room of the heptagon a hexan officer turned fiercely to another, who was offering advice.

    Spacehounds of IPC

    Edward Elmer Smith

  • As that dazzling wall sprang into being, the sparkling green protection died from the walls of the heptagon.

    Spacehounds of IPC

    Edward Elmer Smith

  • There he and his fellows labored day after day learning every secret of every item of armament and equipment aboard the heptagon.

    Spacehounds of IPC

    Edward Elmer Smith

British Dictionary definitions for heptagon


  1. a polygon having seven sides
Derived Formsheptagonal (hɛpˈtæɡənəl), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for heptagon


1560s, from Middle French heptagon, from Greek heptagonon, from hepta "seven" (cognate with Latin septem, Gothic sibun, Old English seofon; see seven) + gonia "angle" (see knee (n.)). Related: Heptagonal.

Online Etymology Dictionary, © 2010 Douglas Harper

heptagon in Science


  1. A polygon having seven sides.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.