mole

US /moʊl/
UK /moʊl/
"mole" picture
1.

a small, dark, permanent spot on the skin

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She had a small mole on her cheek.
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It's important to check your moles regularly for changes.
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birthmarknevus
2.

a small, burrowing mammal with very small eyes, a pointed snout, and soft fur

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The gardener was frustrated by the mole hills in his lawn.
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A mole can dig tunnels very quickly.
3.

a spy who has infiltrated an organization, especially a government agency or political party

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The agency discovered there was a mole within their ranks.
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They suspected a mole was leaking information to the enemy.
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spyinformantinfiltratordouble agent
4.

the SI unit of amount of substance, equal to the quantity containing as many elementary entities as there are atoms in 0.012 kg of carbon-12

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One mole of water contains approximately 6.022 x 10^23 molecules.
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The chemist calculated the number of moles in the sample.
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mole rat