WordReference Random House Learner's Dictionary of American English © 2019
di•ox•in /daɪˈɑksɪn/USA pronunciation   n. [uncountable]
  1. Chemistry, Drugsa general name for a family of chemicals called chlorinated hydrocarbons, esp. the poisonous, harmful by-product resulting from the manufacture of certain pesticides.

WordReference Random House Unabridged Dictionary of American English © 2019
di•ox•in  (dī oksin),USA pronunciation n. [Chem.]
  1. Chemistry, Drugsa general name for a family of chlorinated hydrocarbons, C12H4Cl4O2, typically used to refer to one isomer, TCDD, a by-product of pesticide manufacture: a toxic compound that is carcinogenic and teratogenic in certain animals. Also called  TCDD   Cf. Agent Orange.
  • di-1 + ox- + -in2 1965–70

Collins Concise English Dictionary © HarperCollins Publishers::

dioxin /daɪˈɒksɪn/ n
  1. any of a number of mostly poisonous chemical by-products of the manufacture of certain herbicides and bactericides, esp the extremely toxic 2,3,7,8-tetrachlorodibenzo-para-dioxin

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