Definition of dam noun from the Oxford Advanced American Dictionary

     

    dam

     noun
    noun
    NAmE//dæm//
     
     
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  1. 1 a barrier that is built across a river in order to stop the water from flowing, used especially to make a reservoir (= a lake for storing water) or to produce electricity the Hoover dam on the border of Arizona and Nevada The dam burst.
  2. 2(technology) the mother of some animals, especially horses compare sire
  3. 3= dental dam
See the Oxford Advanced Learner's Dictionary entry: dam