Arris

1. n. 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.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.