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dioxin (n.)

1919, from dioxy-, word-forming element in chemistry indicating the presence of two oxygen atoms or two additional oxygen atoms (see di- (1) + oxy-) + chemical suffix -in (2). All the compounds in the group are characterized by two oxygen atoms.

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Definitions of dioxin

dioxin (n.)
any of several toxic or carcinogenic hydrocarbons that occur as impurities in herbicides;
From wordnet.princeton.edu