heptagon

[hep-tuh-gon]

Origin

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noun

a polygon having seven angles and seven sides.

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Origin:
1560–70; < Greek heptágōnos seven-cornered. See hepta-, -gon

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Heptagon is always a great word to know.

So is ninnyhammer. Does it mean:

a scrap or morsel of food left at a meal.

a fool or simpleton; ninny.

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Collins

World English Dictionary

heptagon (ˈhɛptəɡən)

—n
	a polygon having seven sides

heptagonal

—*adj*

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

heptagon

1570, from Gk. heptagonon, from hepta "seven" (cognate with L. septem, Goth. sibun, O.E. seofon; see seven) + gonia "angle" (see knee).

American Heritage

Science Dictionary

heptagon

(hěp'tə-gŏn') Pronunciation Key
A polygon having seven sides.

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Related Words

polygon

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heptagon

hep·ta·gon