tox·in /ˈtɑksən/
  毒素
  tox·in /ˈtɑksən/ 名詞
  毒,毒素
  Tox·in, Tox·ine  n.  A poisonous product formed by an organism, such as a pathogenic bacterium, a plant or an animal, usually having a high molecular weight, often a protein or a polysaccharide, but occasionally a low-molecular weight agent such as tetrodotoxin.
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  toxin
       n : a poisonous substance produced during the metabolism and
           growth of certain microorganisms and some higher plant
           and animal species