opus caementum

opus caementum

Ancient Roman masonry formed of small rough stones set in a mixture of concrete composed of sand, lime, and often pozzolan.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
John (Hospitallers) in the twelfth--thirteenth centuries, the hilltop fortification has masonry walls made with and without mortar, using the opus caementum technology (Roman concrete).