heptagonal

[hep-tag-uh-nl]
adjective
having seven sides or angles.

Origin:
1605–15; heptagon + -al1

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World English Dictionary
heptagon (ˈhɛptəɡən)
 
n
a polygon having seven sides
 
heptagonal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
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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