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Use "octangular" in a sentence
"From Chia we went to see the center of Cota: it has an octangular central plaza."
"The mausoleum of Selim II was a square structure, wrapped around an octangular upper story that was capped by a mottled lead dome."
"Saint Bernard himself, being composed of what was then called Burrel cloth, exactly fitted to the size of the wearer, and bearing on the left shoulder the octangular cross peculiar to the Order, formed of red cloth."