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heptagonal

[hep-tag-uh-nl] /hɛpˈtæg ə nl/
adjective
1.
having seven sides or angles.
Origin
1605-1615
1605-15; heptagon + -al1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for heptagonal
  • One shows a dome encircled by a heptagonal observation deck and entered through an exterior administrative wing.
  • Detailed study indicates their origin to be the heptagonal defects present in the neck region.

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