Usage Note
Ottagonale describes any shape or structure with eight sides and eight angles. It is used in architecture (una pianta ottagonale — an octagonal floor plan), design, and geometry. The noun counterpart is ottagono (octagon). The Baptistery in Florence (il Battistero) is a famous example of Italian octagonal architecture.
Examples
"La torre ha una base ottagonale."
Natural Translation
The tower has an octagonal base.

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