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
2. spicy sauce often containing chocolate
3. a spy who works against enemy espionage
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
6. small velvety-furred burrowing mammal having small eyes and fossorial forefeet