1877 Watts Fownes'Chem. (ed. 12) II. 541Two dioxy⁓benzoic acids are obtained by fusing the two disulpho⁓benzoic acids with potassium hydroxide. One of these dioxy-acids forms crystals..not coloured by ferric chloride. 
| 词汇 | diox- | 
| 词根词缀 | OED 
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