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heptagon

[hep-tuh-gon, -guh n] /ˈhɛp təˌgɒn, -gən/
noun
1.
a polygon having seven angles and seven sides.
Origin of heptagon
1560-1570
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 Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for heptagon

heptagon

/ˈhɛptəɡən/
noun
1.
a polygon having seven sides
Derived Forms
heptagonal (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
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Word Origin and History for heptagon
n.

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
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heptagon in Science
heptagon
  (hěp'tə-gŏn')   
A polygon having seven sides.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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14
16
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