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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