[mass noun]a highly toxic compound produced as a by-product in some manufacturing processes, notably herbicide production and paper bleaching. It is a serious and persistent environmental pollutant 二氧(杂)芑,二(口恶)英
A heterocyclic organochlorine compound; alternative name: 2,3,7,8-tetrachlorodibenzoparadioxin abbrev.: TCDD; chem. formula: C12H4O2C14 一种杂环有机氯化合物;又名:2,3,7,8-四氯代二苯并-对-二(口恶)英;四氯二苯并对二(口恶)英(缩略词:TCDD);化学分子式:C12H4O2C14 ■[count noun]any of the class of compounds to which this belongs 二氧(杂)芑类化合物
语源
early 20th cent.: from di- 'two' + ox- 'oxygen' + -in