Also found in: Idioms.
An outer dome built over an inner dome, with a space between them; used to provide a supporting structure for the outer dome, or a different shape or architectural treatment to each one individually.See also: Dome
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
A pair of domes, one set within the other, both of which have the same center of curvature.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.