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groin,in oceanography: see coast protectioncoast protection,
methods used to protect coastal lands from erosion. Beaches can exist only where a delicate dynamic equilibrium exists between the amount of sand supplied to the beach and the inevitable losses caused by wave erosion.
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in architecture, that part of a vault that is formed by the intersection of two mutually perpendicular cylindrical surfaces. Groins are usually placed at the highest point of the apertures, above the abutment of the main vault. They form small vaults, whose radius is determined by the width of the apertures.
The Moscow Kremlin’s Teremnoi Palace, built in 1635–36 by the architects A. Konstantinov, T. Sharutin, L. Ushakov, and B. Ogurtsov, has examples of groins in its Council Chamber.