a small animal with dark grey fur, that is almost blind and digs tunnels under the ground to live in

a small dark brown mark on the skin, sometimes slightly higher than the skin around it

a person who works within an organization and secretly passes important information to another organization or country

<i>They suspected that a mole had been planted in the organization.</i>

<i>A police mole working inside the company had supplied them with the details.</i>

a unit for measuring the amount of substance

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