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ortho-xylene

American  
[awr-thoh-zahy-leen] / ˌɔr θoʊˈzaɪ lin /

noun

  1. Chemistry. a clear, colorless, poisonous, flammable liquid, C 8 H 10 , the ortho isomer of xylene: used chiefly in the synthesis of phthalic anhydride.

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