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n. pl. arris or ar·ris·es
The sharp edge or ridge formed by two surfaces meeting at an angle, as in a molding.
[Alteration of Old French areste, fishbone, spine; see arête.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n, pl -ris or -rises
(Architecture) a sharp edge at the meeting of two surfaces at an angle with one another, as at two adjacent sides of a stone block
[C17: apparently from Old French areste beard of grain, sharp ridge; see arête]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. a sharp ridge, as between adjoining channels of a Doric column.
2. the line, ridge, or hip formed by the meeting of two surfaces at an exterior angle.
[1670–80; < Middle French areste; see arête]
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