Science Natural Science Jargon Watch: Toxin vs Toxicant By Lloyd Alter Design Editor University of Toronto Lloyd Alter is Design Editor for Treehugger and teaches Sustainable Design at Ryerson University in Toronto. our editorial process Facebook Facebook Twitter Twitter Lloyd Alter Updated October 11, 2018 Migrated Image Share Twitter Pinterest Email Science Space Natural Science Technology Agriculture Energy Kim Boekelheide with TreeHugger hero Meg Kissinger The very first thing that Professor Kim Boekelheide did at the Metcalf Institute's Science seminar for Journalists last week was to complain about the misuse of the word "toxin." Toxins are from biological sources only. They are "a poisonous substance produced by living cells or organisms." Snake venom is a toxin; Bisphenol A or artificial chemicals are Toxicants. Pedant that I am, my post Today's Toxin: Atrazine, the Weed Killer in your Water is embarrassing. Wikipedia writes:When used non-technically, the term "toxin" is often applied to any toxic substances. Toxic substances not of biological origin are more properly termed poisons. Many non-technical and lifestyle journalists also follow this usage to refer to toxic substances in general, though some specialist journalists at publishers such as the BBC and The Guardian maintain the distinction that toxins are only those produced by living organisms. But if a prominent toxicologist thought it important enough to make it his first slide, maybe those " non-technical and lifestyle journalists" should attempt to get it right.