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Definition mole in British English

mole noun

[countable] noun
/məʊl/
1

a small animal with dark fur that digs underground and cannot see well

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2

a dark brown lump or spot on your skin that is permanent

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3

someone who joins or works for an organization in order to give secret information about it to other people, especially to its enemies

Example

They suspected there was a mole within party headquarters.

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4

a strong wall built from the land into the sea to protect the land from the waves

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5

a unit for measuring the number of molecules in a substance

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Definition mole in British English