n : a carcinogenic dioxin C12H4O2Cl4 found esp. as a contaminant in 2,4,5-T - called also 2,3,7,8-tetrachlorodibenzo-para-dioxin, 2,3,7,8-tetrachlorodibenzo-p-dioxin . Published under license with Merriam-Webster, Incorporated. © 1997-2024.