heptagon

hep·ta·gon Audio Help (hěp'tə-gŏn')

n. A polygon having seven sides.

[Latin heptagōnon, from Greek heptagōnos, having seven angles : hepta-, hepta- + -gōnos, angled; see -gon.]
hep·tag'o·nal (-tāg'ə-nəl) adj.

(Download Now or Buy the Book)
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.