poisonous substance n any substance that causes injury or illness or death of a living organism Synonym(s) poison toxicant
News & Articles poisonous substance Hatboro Man Accused Of Sending Ricin-Laced Birthday Card Authorities say a 19-year-old Hatboro man was arrested Wednesday after police learned he allegedly sent an envelope laced with the poisonous substance ricin. March 20, 2014 - CBS Philadelphia