mole
mole
noun
The SI unit of amount of substance, equal to Avogadro's number.
"One mole of carbon weighs 12 grams."
noun
A small, usually dark, permanent spot or mark on human skin.
"She had a mole near her eye."
noun
A spy who has infiltrated an organisation to secretly pass information.
"They suspected a mole in the agency."
noun
A small, dark-furred mammal living underground, known for digging tunnels.
"The gardener found a molehill in the lawn."
Thesaurus
Synonyms: mol, gram molecule, breakwater, bulwark, groyne, groin, jetty, seawall, counterspy