Heptangular
Nuttall's Standard Dictionary of the English Language · 1890 · p. 94
hep-tang'-gu-lar,a.having seven angles (Gr.hept a, and angular).
Bu kavram başka kaynaklarda da geçiyor
The American Dictionary and Cyclopedia (1910)
Chamber's Twientieth Century Dictionary (1908)
The Optical Dictionary (1904)
The Century Dictionary: The Encyelopedic Lexicon of the English Language (1887)
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