Definition of "decagonal" [de•cag•o•nal]

• Shaped like a decagon. (adjective)

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• "“Straight edges and compasses work fine for the recurring symmetries of the simplest patterns we see, but it probably required far more powerful tools to fully explain the elaborate tiling with decagonal 10-sided symmetry,” Mr Lu said."
• "While traveling in Uzbekistan, Lu said, he noticed a 16th century Islamic building with decagonal motif tiling, arousing his curiosity as to the existence of quasicrystalline Islamic tilings."
• "The mausoleum of Theodoric, a decagonal structure, covered with a great monolith thirty-six feet in diameter, is the monument that reveals Roman art in its purest form, at once austere and graceful."