A "poisoner" is someone who intentionally gives harmful or deadly substances to others, usually with the intention of causing harm or death. Full definition
IT IS the unnoticed poisoner of the world's farmland. (newscientist.com)
Anyone who remains dubious about the power of the sheepmen or the impossibility of serious prosecution of illegal poisoners in sheep country has only to study the so - called A ram be I Case, a landmark in the annals of frustrating Western jurisprudence. (si.com)
Unfortunately, the strange case of the accused cat poisoner didn't end well, either. (conservationmagazine.org)