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Definition of sealer noun from the Oxford Advanced Learner's Dictionary

sealer

noun
 
/ˈsiːlə(r)/
 
/ˈsiːlər/
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  1. (also sealant)
    [uncountable, countable] a substance that is put onto a surface to stop air, water, etc. from entering or escaping from it
  2. [countable] a person who hunts seals
  3. [countable] a ship used for hunting seals
See sealer in the Oxford Advanced American Dictionary

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