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Canterbury Cathedral, Kent., Crypt

GROINGlossary Term VAULTS are formed from two intersecting barrel vaults (the groins are the edges of the intersections). They are built of heavy rubbleGlossary Term masonry and so need adequate support. They were used in the large crypts introduced by the Normans below their new abbeys and cathedrals, where the space was divided into a series of small bays by numerous columns, as at Canterbury, Worcester and Gloucester.