• (British) IPA: /ˈtɒk.sɪk/
  • (America) IPA: /ˈtɑk.sɪk/


  1. (toxicology) Having a chemical nature that is harmful to health or lethal if consumed or otherwise entering into the body in sufficient quantities.
    Synonyms: poisonous, venomous
    Tobacco smoke contains many toxic substances.
  2. (medicine) Appearing grossly unwell; characterised by serious, potentially life-threatening compromise in the respiratory, circulatory or other body systems.
    The child appeared toxic on arrival at the hospital.
  3. (figurative) Severely negative or harmful.
    a toxic environment that promoted bullying
  4. (figurative, of a person) Hateful or strongly antipathetic.
    It is not good to be around toxic people.
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