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From The Collaborative International Dictionary of English v.0.48:
Kissingcrust \Kiss"ing*crust`\, n. (Cookery) The portion of the upper crust of a loaf which has touched another loaf in baking. --Lamb. [1913 Webster] A massy fragment from the rich kissingcrust that hangs like a fretted cornice from the upper half of the loaf. --W. Howitt. [1913 Webster]