ortho-xylene

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

noun

Chemistry. a clear, colorless, poisonous, flammable liquid, C8H10, the ortho isomer of xylene: used chiefly in the synthesis of phthalic anhydride.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019