tox·oid /ˈtɑkˌsɔɪd/
  變性毒素,類毒素
  tox·oid /ˈtɑkˌsɔɪd/ 名詞
  Tox·oid n.   Physiol. Chem. An altered form of a toxin, possessing little or no toxic power.
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  toxoid
       n : a bacterial toxin that has been weakened until it is no
           longer toxic but is strong enough to induce the formation
           of antibodies and immunity to the specific disease caused
           by the toxin; "diphtheria toxoid" [syn: anatoxin]