Plural of groin; the curved edges or ridges formed where two vault surfaces meet in a building, or the areas where legs meet the body.
From Old French 'groigne,' eventually evolving to mean both anatomical junctions and architectural features where vault surfaces intersect.
The word 'groin' has two completely different meanings—one anatomical and one architectural—yet they share the same root because both describe places where two things meet at an angle!
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