Definition of monster noun from the Oxford Advanced American Dictionary

     

    monster

     noun
    noun
    NAmE//ˈmɑnstər//
     
     
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  1. 1(in stories) an imaginary creature that is very large, ugly, and frightening a monster with three heads prehistoric monsters
  2. 2an animal or a thing that is very large or ugly Their dog's an absolute monster!
  3. 3a person who is very cruel and evil
  4. 4(humorous) a child who behaves badly
See the Oxford Advanced Learner's Dictionary entry: monster