1. The outer curved surface of an arch or vault.
Usage: architecture; technical

Examples

• The extrados of the stone arch was decorated with carved moldings.
• Architects carefully designed the extrados to support the weight of the structure above.
• The bridge's extrados was visible from below, showing the graceful curve of the arch.
• Water runoff flows across the extrados of the vault to prevent pooling.
• The extrados and intrados together define the thickness of the arch.