Definition of "poisoner" [poi•son•er]

• A person who poisons something or someone. (noun)

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• "“It seems”—he struggled for breath—“it seems that you have been labelled a poisoner!”"
• "In any event, it's fortunate for W that if he was intentionally poisoned, the poisoner was as effective at his job as W was at HIS."
• "It is possible for me to imagine, in the face of certain undeniable signs, that the poisoner is a second man."