Arris

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arris

[′ar·əs]
(architecture)
A short edge or angle at the junction of two surfaces, especially moldings and raised edges.
(geology)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Arris

An external angular intersection between two sharp planar or curved faces, as in moldings; or between two flutes in a Doric column.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

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.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.