magnesia cement[mag′nē·zhə si′ment]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
Magnesium oxide mixed with water, often with the addition of asbestos fibers; used to cover steam pipes, furnaces, etc.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.