Heptagon
Chamber's Twientieth Century Dictionary · 1908 · p. 48
hep′ta-gon, n. a plane figure with seven angles and seven sides.— adj. Heptag′onal . [Gr. heptagōnos , seven-cornered— hept a , seven, gōnia , an angle.]
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The American Dictionary and Cyclopedia (1910)
The Optical Dictionary (1904)
Chandler's Encyclopedia (1898)
Chamber's Etymological of the English Language (1895)
An Illustrated Encyclopedic Medical Dictionary (1893)
An Illustrated Dictionary of Words Used In Art and Archealogy. (1883)
Zell's Condensed Dictionary (1879)
Dictionary of Science, Literature and Art (1854)
Dictionary of Science, Literature and Art (1842)
A Military Dictionary (1810)
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