1. A combination of hydraulic-setting cement (or other bonding ingredient) and a loose-fill insulation, mixed to a workable putty-like consistency; used in insulation applications to fill voids, joints, etc.
2. A mixture of dry granular, fibrous, flaky, or powdery materials that develops a plastic consistency when mixed with water, and when dried in place; forms a coherent covering that provides substantial resistance to heat transmission.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.