Arris
Arris ({not transcribed}) , noun
[Old French areste, French arête, from Latin arista the top or beard of an ear of grain, the bone of a fish.]
(Architecture) 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
Collocations (2)
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