arch ring[′ärch ‚riŋ]
A curved member that provides the main support of an arched structure.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
In an arched structure, the curved member that sustains the principal load.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.