Heptagonal - Definitions from Dictionary.com

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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

hep·tag·o·nal

Audio Help [hep-tag-uh-nl] Pronunciation Key

–adjective

having seven sides or angles.

[Origin: 1605–15; heptagon + -al¹

]

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

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Heptagonal

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hep·ta·gon Audio Help (hěp'tə-gŏn') Pronunciation Key

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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.

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The American Heritage® Dictionary of the English Language, Fourth Edition
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Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Heptagonal

Hep*tag"o*nal\, a. [Cf. F. heptagonal.] Having seven angles or sides.

Heptagonal numbers (Arith.), the numbers of the series 1, 7, 18, 34, 55, etc., being figurate numbers formed by adding successively the terms of the arithmetical series 1, 6, 11, 16, 21, etc.

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