seal
noun
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any of numerous marine mammals that come on shore to breed
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a device incised to make an impressionstamp
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fastener that provides a tight and perfect closure
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a finishing coat applied to exclude moisture
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fastener consisting of a resinous composition that is plastic when warm“used for sealing documents and parcels and letters”
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an indication of approved or superior statuscachetseal of approval
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a stamp affixed to a document (as to attest to its authenticity or to seal it)“the warrant bore the sheriff's seal”
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the pelt or fur (especially the underfur) of a seal“a coat of seal”sealskin
verb
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decide irrevocably“sealing dooms”
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hunt seals
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cover with varnishvarnish
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close with or as if with a seal“We sealed the invitations with hot wax.”
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make tightseal off
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affix a seal to“seal the letter”