Definition of beast noun from the Oxford Advanced American Dictionary

     

    beast

     noun
    noun
    NAmE//bist//
     
     
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  1. 1(old-fashioned or formal) an animal, especially one that is large or dangerous, or one that is unusual wild/savage/ferocious beasts mythical beasts such as unicorns and dragons
  2. 2a person who is cruel and whose behavior is uncontrolled synonym animal
  3. 3(informal) (often humorous) an unpleasant person or thing The math exam was a real beast.
  4. 4(informal) a thing of a particular kind synonym animal His new guitar is a very expensive beast.
See the Oxford Advanced Learner's Dictionary entry: beast