Arris

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Related to arrises: arises

arris

[′ar·əs]
(architecture)
A short edge or angle at the junction of two surfaces, especially moldings and raised edges.
(geology)

Arris

An external angular intersection between two sharp planar or curved faces, as in moldings; or between two flutes in a Doric column.

arris, aris

1. An external angular intersection between two planar faces (an edge), or two curved faces, as in moldings or between two flutes on a Doric column or between a flute and the fillet on an Ionic or a Corinthian column.
2. The sharp edge of a brick.