Having an extrados; constructed with a visible or prominent outer curved surface (of an arch).
From 'extrados' + '-ed' suffix, used as an adjective in architectural description. Primarily a technical term in architectural analysis and design.
Medieval builders didn't always use the term 'extradosed,' but they absolutely understood the principle—flat-topped arches versus rounded ones had completely different structural properties, and the shape of that extrados determined whether a bridge would stand or fall.
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