seal

US /siːl/
UK /siːl/
"seal" picture
1.

a device or substance that is used to join two things together so as to prevent them from coming apart or to prevent anything from passing between them

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The broken seal caused the leak.
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Make sure the seal on the container is tight.
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gasketclosurefastenerplugstopper
2.

a piece of wax, lead, or other material with an individual design stamped into it, attached to a document as a mark of authenticity or used to close a letter or package

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The king's letter bore his royal seal.
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The document was authenticated with an official seal.
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stampimprintmarkembleminsignia
3.

a carnivorous marine mammal with flippers, a streamlined body, and a layer of blubber, able to live on land and in water

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We saw a seal basking on the rocks.
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Seals are excellent swimmers.
1.

fasten or close securely, so that air, liquid, or other contents cannot enter or escape

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Please seal the envelope before mailing it.
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The jar was perfectly sealed to keep the contents fresh.
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closefastensecureshutcork
2.

formally certify or approve (something)

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The deal was sealed with a handshake.
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Their fate was sealed when the enemy attacked.
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confirmfinalizeratifyapproveauthenticate
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elephant sealsigned and sealedseal someone's fatemy lips are sealed