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ortho-xylene

[awr-thoh-zahy-leen]
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noun
  1. Chemistry. a clear, colorless, poisonous, flammable liquid, C8H10, the ortho isomer of xylene: used chiefly in the synthesis of phthalic anhydride.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018