antioxidant

1. (nutrition) One of a group of vitamins that act against the effects of free radicals.Examples: "Although BHA (butylated hydroxyanisole) and BHT (butylated hydroxytoluene) are avoided by some consumers because several studies have suggested they may be toxic or carcinogenic (they are banned in Britain), these antioxidants have also been shown to inhibit the action of cancer-causing chemicals, and BHT has been shown to suppress the growth of harmful viruses."; "The postulated mechanism for the reaction of coumarin 4 as an antioxidant, as indicated in Fig 3, relies on the mercapto hydrogen atom (bold), which is under the influence of resonance and inductive effects."