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Definition seal in British English

seal noun

[countable] noun
/siːl/
1

a large sea animal that eats fish and lives mainly in cold parts of the world. Seals are amphibious (=they can live both in water and on land). A young seal is called a pup.

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2

a piece of something such as wire or wax that seals a container and that you have to break before you can open the container

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2.1

a shaped piece of something such as rubber that closes a hole inside a machine so that air or other substances cannot get in or out

Example

I replaced the seal, but oil is still leaking out.

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3

a special mark that you put on something, for example a document, to show that it is legal or official

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Definition seal in British English