Definition of mole noun from the Oxford Advanced Learner's Dictionary

     

    mole

     noun
    noun
    BrE BrE//məʊl//
     
    ; NAmE NAmE//moʊl//
     
    Wild mammals
     
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  1. 1 a small animal with dark grey fur, that is almost blind and digs tunnels under the ground to live in see also molehill See related entries: Wild mammals
  2. 2 a small dark brown mark on the skin, sometimes slightly higher than the skin around it compare freckle See related entries: Wild mammals
  3. 3a person who works within an organization and secretly passes important information to another organization or country They suspected that a mole had been planted in the organization. A police mole working inside the company had supplied them with the details.
  4. 4 (chemistry) a unit for measuring the amount of substance
  5. Word Origin sense 1 and sense 3 late Middle English: from the Germanic base of Middle Dutch and Middle Low German mol. sense 2 Old English māl ‘discoloured spot’, of Germanic origin. sense 4 early 20th cent.: from German Mol, from Molekul, from Latin molecula, diminutive of Latin moles ‘mass’.

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