Definition of dioxane in US English:


(also dioxan)


  • A colorless toxic liquid used as an organic solvent.

    A heterocyclic compound with a ring of four carbon and two oxygen atoms; chemical formula: C₄H₈O₂

    • ‘This led to hydrogen abstraction from dioxane by curcumin triplet state and the formation of the corresponding ketyl radical.’
    • ‘After incubation the agarose was washed successively with dioxane solution, dioxane, distilled water and ethanol.’
    • ‘In a manner similar to the UV-absorption, the excimer fluorescence emission of la [meso] in aqueous solution was affected by the presence of less-polar aprotic solvent THF or dioxane.’
    • ‘For Bchl and Chl dissolved in diethyl ether, toluene, acetone, ethanol and acetonitrile, the Mg atom was found to be pentacoordinated, whereas it was hexacoordinated in dioxane, tetrahydrofuran, pyridine and methanol.’
    • ‘Carcinogens, such as dioxane and nitrosamine, are commonly formed in synthetic concoctions and are virtually impossible for us to know about.’


Early 20th century: from di- ‘two’ + ox- ‘oxygen’ + -an (or -ane).