1. (Chem.) A cement of clay or other tenacious infusible substance for sealing joints in apparatus, or the mouths of vessels or tubes, or for coating the bodies of retorts, etc., when exposed to heat; -- called also luting. 2. A packing ring, as of rubber, for fruit jars, etc. 3. (Brick Making) A straight-edged piece of wood for striking off superfluou...
