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dioxan

dioxane (daɪˈɒkseɪn)

/ (daɪˈɒksən) /
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noun
a colourless insoluble toxic liquid made by heating ethanediol with sulphuric acid; 1,4-diethylene dioxide: used as a solvent, esp for waxes and cellulose acetate resins. Formula: (CH 2) 2 O(CH 2) 2 O
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Which of the following nouns has an irregular plural form?
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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