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Meaning of au gratin

au grat•in

Pronunciation: (ō grät'n, ō grat'n, ô grät'n, ô grat'n Fr. ō gra&sylptan'), [key]
— Cookery. Cookery.
  1. cooked or baked with a topping of either browned bread crumbs and butter or grated cheese, or with both.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.