GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Arris , n. [OF. areste, F. arête, fr. L. arista the top or beard of an ear of grain, the bone of a fish.] (Arch.) The sharp edge or salient angle formed by two surfaces meeting each other, whether plane or curved; -- applied particularly to the edges in moldings, and to the raised edges which separate the flutings in a Doric column.
   P. Cyc.
   
   1913 Webster
   Arris fillet, a triangular piece of wood used to raise the slates of a roof against a chimney or wall, to throw off the rain. Gwilt. -- Arris gutter, a gutter of a V form fixed to the eaves of a building. Gwilt.
   1913 Webster