/ ˈgeɪbl; NAmE / noun
the upper part of the end wall of a building, between the two sloping sides of the roof, that is shaped like a triangle
—picture at house
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WORD ORIGIN
Middle English : via Old French from Old Norse gafl , of Germanic origin; related to Dutch gaffel and German Gabel fork (the point of the gable originally being the fork of two crossed timbers supporting the end of the roof-tree).