arris

Etymology 1
From, from. .

Noun

 * 1) A sharp edge or ridge formed by the intersection of two surfaces
 * 2)  A sharp edge or ridge formed by the intersection of two curved surfaces
 * 3)  A ridge formed on the surface of flaked stone, such as a arrowhead or hand axe, as the result of the intersection of two or more flake removals.

Translations

 * Portuguese:

Etymology 2
Rhyming slang via Aristotle = bottle, then bottle and glass, then arse.

Noun

 * 1)  Buttocks, arse.