This meaning refers to a small dark-furred mammal adapted to living underground.
A mole dug tunnels beneath the lawn.
Moles have strong front feet for digging.
This figurative meaning refers to a person secretly working for an opposing organization.
The agency discovered a mole in its security department.
The mole had leaked information for years.
In chemistry, the mole is the SI unit for amount of substance.
One mole contains a fixed number of particles.
Calculate the number of moles in the sample.
