[ see-luhnt ]
See synonyms for sealant on
  1. a substance used for sealing, as sealing wax or adhesives.

  2. 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.

  1. 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

Words Nearby sealant Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use sealant in a sentence

British Dictionary definitions for sealant


/ (ˈsiːlənt) /

  1. any substance, such as wax, used for sealing documents, bottles, etc

  2. 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