[hep-tuh-gon, -guh n]


a polygon having seven angles and seven sides.

Nearby words

  1. hepta-,
  2. heptachlor,
  3. heptachord,
  4. heptad,
  5. heptadecanoic acid,
  6. heptagonal,
  7. heptahedron,
  8. heptahydrate,
  9. heptamerous,
  10. heptameter

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. 2019

Examples from the Web for heptagon

British Dictionary definitions for heptagon



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

Science definitions for heptagon



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