Simple past tense and past participle of groin.(verb)
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Use "groined" in a sentence
"The room in which Queen Bimbane received me was a superb apartment, magnificently decorated with elaborately carved columns supporting a kind of groined roof, the walls being draped with splendid tapestry worked on silk in gold thread, and hung with several enormous mirrors of polished silver in massive gold frames -- brackets supporting clusters of lamps on either side of each."
"The rood-loft generally projected in front, so as to form a kind of groined cove, the ribs of which sprang or diverged from the principal uprights of the screen beneath."
"The joined arcs made the shape of birth and craving And the welded-open shape kept mouthing O.Ossified cords held the corners together In groined spirals pleated like a summer dress."