arris

[ar-is]

noun Architecture.

a sharp ridge, as between adjoining channels of a Doric column.
the line, ridge, or hip formed by the meeting of two surfaces at an exterior angle.

Origin of arris

1670–80; < Middle French areste; see arête

Also called piend.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for arrises

Historical Examples of arrises

When the work will permit, it is desirable to round the arrises to about a ⅜-in.
Concrete Construction
Halbert P. Gillette
After this, the arrises may again be planed until it has 16 and then 32 sides.
Mission Furniture
H. H. Windsor
Much skill and care is required to retain the arrises sharp and the curved members of accurate and proportionate outline.
Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 7
Various
It is well to chamfer the arrises at the end of the tenon to insure its starting easily into the mortise.
Handwork in Wood
William Noyes

British Dictionary definitions for arrises

arris

noun plural -ris or -rises

a sharp edge at the meeting of two surfaces at an angle with one another, as at two adjacent sides of a stone block

Word Origin for arris

C17: apparently from Old French areste beard of grain, sharp ridge; see arête

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012