Arris

n.

1.

(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. 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. Arris gutter a gutter of a V form fixed to the eaves of a building. - Gwilt.