xylene noun. ['zʌɪli:n] M19.
[from XYL(O- + -ENE.]
Chemistry. Each of three isomeric volatile liquid hydrocarbons with the formula C₆H₄(CH₃)₂, obtainable by distillation of wood, coal tar, and petroleum, and used in fuels, in solvents, and in chemical synthesis; dimethylbenzene. Also, a mixture of these. Also called xylol.

■ xylenol ['zʌɪlɪnɒl] noun each of five solid toxic isomeric compounds having the formula C₆H₃(CH₃)₂OH (dimethylphenol); a mixture of these: L19.

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