Heptangular
Chamber's Twientieth Century Dictionary · 1908 · p. 48
hept-ang′gū-lar, adj. having seven angles. [Gr. hept a , seven, and angular .]
Bu kavram başka kaynaklarda da geçiyor
The American Dictionary and Cyclopedia (1910)
The Optical Dictionary (1904)
Nuttall's Standard Dictionary of the English Language (1890)
The Century Dictionary: The Encyelopedic Lexicon of the English Language (1887)
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