Webster's English Dictionary

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mole

1. mole \'mo-l\ n [ME, fr. OE ma-l; akin to OHG meil spot] : a congenital 
   spot, mark, or small permanent protuberance on the human bo dy; esp : a 
   pigmented nevus
2. mole n [ME; akin to MLG mol] 1: any of numerous burrowing insectivores 
   (esp. family Talpidae) with minut e eyes, concealed ears, and soft fur 2: 
   one who works in the dark 
3. mole n [MF, fr. OIt molo, fr. LGk mo-los, fr. L moles, lit., mass], 
   exertion; akin to OHG muodi weary, Gk mo-los exertion 1: a massive work 
   formed of masonry and large stones or earth laid in the s ea as a pier or 
   breakwater 2: the harbor formed by a mole 
4. mole n [F mo^le, fr. L mola mole, lit., mill, millstone - more at MI]LL 
   : an abnormal mass in the uterus esp. when containing fetal tissues 
5. mole also mol \'mo-l\ n [G mol, short for molekulargewicht molecular 
   weight, fr. molekul]ar molecular + gewicht weight : GRAM MOLECULE