sealant

[see-luhnt]

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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Sealant is always a great word to know.
So is quincunx. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
World English Dictionary
sealant (ˈsiːlənt)
 
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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