[see-luh nt]


a substance used for sealing, as sealing wax or adhesives.
any of various liquids, paints, chemicals, or soft substances that may be applied to a surface or circulated through a system of pipes or the like, drying to form a hard, watertight coating.
Dentistry. any of several transparent synthetic resins applied to the chewing surfaces of molars and premolars in young children and teenagers as a preventive measure against tooth decay in the occlusal pits and fissures.

Origin of sealant

1940–45; seal1 + -ant, probably by analogy with coolant Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for sealant

Historical Examples of sealant

British Dictionary definitions for sealant



any substance, such as wax, used for sealing documents, bottles, etc
any of a number of substances used for stopping leaks, waterproofing wood, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for sealant

1945, from seal (v.) + -ant.

Online Etymology Dictionary, © 2010 Douglas Harper