Definition of vermin noun from the Oxford Advanced American Dictionary

     

    vermin

     noun
    noun
    NAmE//ˈvərmən//
     
    [plural]
     
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  1. 1wild animals or birds that destroy plants or food, or attack farm animals and birds On farms the fox is considered vermin and treated as such.
  2. 2insects that live on the bodies of animals and sometimes humans The room was crawling with vermin.
  3. 3(disapproving) people who are very unpleasant or dangerous to society
See the Oxford Advanced Learner's Dictionary entry: vermin