Etymology
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sealer (n.)

"one who hunts seals," by 1770, from seal (n.2). Related: Sealery.

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Definitions of sealer

sealer (n.)
a kind of sealing material that is used to form a hard coating on a porous surface (as a coat of paint or varnish used to size a surface);
Synonyms: sealant
sealer (n.)
an official who affixes a seal to a document;
From wordnet.princeton.edu