1. a person who kills or harms someone by giving them poison

Examples

• The detective suspected the butler was the poisoner.
• Historical records show that the poisoner used arsenic in small doses.
• The mystery novel featured a clever poisoner who nearly escaped detection.
• Police arrested the poisoner after finding evidence in his laboratory.
• The victim’s family demanded justice against the poisoner.
• Forensic experts worked to identify the poisoner’s method.