Having groins; built with groin vaults (a type of arched ceiling formed where two barrel vaults intersect at right angles).
From 'groin' (the curved edge where two vault surfaces meet) plus '-ed,' an adjective-forming suffix indicating the presence or state of having groins.
Gothic cathedrals famously feature groined vaults—the intersecting arches create stunning visual effects and distribute weight brilliantly, which is why this architectural style appears in buildings spanning centuries!
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