mole meaning and definition

MOLE noun

Definition of mole (noun)

1. the molecular weight of a substance expressed in grams; the basic unit of amount of substance adopted under the Systeme International d'Unites
   • synonyms: gram molecule, mol
2. a spy who works against enemy espionage
   • synonyms: counterspy
3. spicy sauce often containing chocolate
4. a small congenital pigmented spot on the skin
5. a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away
   • synonyms: breakwater, bulwark, groin, groyne, jetty, seawall
6. small velvety-furred burrowing mammal having small eyes and fossorial forefeet