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

     

    pest

     noun
    noun
    BrE BrE//pest//
     
    ; NAmE NAmE//pest//
     
     
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  1. 1 an insect or animal that destroys plants, food, etc. pest control insect/plant/garden pests
  2. 2(informal) an annoying person or thing That child is being a real pest.
  3. Word Origin late 15th cent. (denoting the bubonic plague): from French peste or Latin pestis ‘plague’.Extra examples Police are looking for a sex pest who is frightening late-night travellers. These birds provide a useful function in controlling insect pests. a pest control officer
See the Oxford Advanced American Dictionary entry: pest