n 1  :  a substance that through its chemical action usu. kills, injures, or impairs an organism  2  :  a substance that inhibits the activity of another substance or the course of a reaction or process <a catalyst > 
vt, poi*soned  poi*son*ing   1  :  to injure or kill with poison  2  :  to treat, taint, or impregnate with poison
adj 1  :  POISONOUS <a plant>   2  :  impregnated with poison <a arrow>  .
 
 
 
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