phenols 2,6-di-tert-butyl-4-methylphenol A member of the class of phenols that is 4-methylphenol substituted by <em>tert</em>-butyl groups at positions 2 and 6. Europe::321 Codex::321 LanguaL term definition: Food additive; technological purpose(s): antioxidant. butylated hydroxytoluene butylated hydroxytoluene (bht) food additive