Heptagon
An Illustrated Dictionary of Words Used In Art and Archealogy. · 1883 · p. 19
(Gr. ἑπτὰ, seven, and γώνη, an angle). A seven-sided figure.
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The American Dictionary and Cyclopedia (1910)
Chamber's Twientieth Century Dictionary (1908)
The Optical Dictionary (1904)
Chandler's Encyclopedia (1898)
Chamber's Etymological of the English Language (1895)
An Illustrated Encyclopedic Medical Dictionary (1893)
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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