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.

1940–45; seal1 + -ant, probably by analogy with coolant Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Tunnel walls were covered with a sealant to permanently bind the coal and rock in place.
Floors in the corridor are light oak while floors in the common areas are cement treated with a sealant.
Sealant not bonded to both sides of the crack shall be removed.
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