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Extrados

The curved upstream surface of horizontal arch elements in an arch dam. See intrados.

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Related terms

extrados
Construction; Bridge

The outer exposed curve of an arch; defines the lower arc of a spandrel.

extrados
Engineering; Civil engineering

The curved upstream surface of horizontal arch elements in an arch dam. See intrados.

extrados
Architecture; General architecture

The convex curve formed by the outer edge of an arch. The inner edge is called the intrados.

extrados
Mining; General mining; Mineral mining

The exterior arc of an arch, as in a tunnel.

extrados
Construction; Bridge

The convex curve of a masonry arch. The upper surface of the voussoirs when in position.

extrados
Construction; Masonry

A construction line denoting outer limit of the arch. It is used in the setting out.

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