seal·ant

[see-luhnt]
noun
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.
3.
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:
1940–45; seal1 + -ant, probably by analogy with coolant

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World English Dictionary
sealant (ˈsiːlənt) [Click for IPA pronunciation guide]
 
n
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
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00:10
Sealant is always a great word to know.
So is slumgullion. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a stew of meat, vegetables, potatoes, etc.
Example sentences
Tunnel walls were covered with a sealant to permanently bind the coal and rock in place.
Sealant not bonded to both sides of the crack shall be removed.
Floors in the corridor are light oak while floors in the common areas are cement treated with a sealant.
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