English

Definition of poisonous adjective from the Oxford Advanced Learner's Dictionary

      

    poisonous

     adjective
    adjective
    BrE BrE//ˈpɔɪzənəs//
     
    ; NAmE NAmE//ˈpɔɪzənəs//
     
    Waste and pollution
     
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  1. 1  causing death or illness if swallowed or absorbed into the body synonym toxic poisonous chemicals/plants This gas is highly poisonous. The leaves of certain trees are poisonous to cattle. See related entries: Waste and pollution
  2. 2  (of animals and insects) producing a poison that can cause death or illness if the animal or insect bites you synonym venomous poisonous snakes a tiny spider with a poisonous bite
  3. 3extremely unpleasant or unfriendly a poisonous person the poisonous atmosphere in the office
See the Oxford Advanced American Dictionary entry: poisonous