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From The Collaborative International Dictionary of English v.0.48:
Cresol \Cre"sol\ (kr[=e]"s[=o]l), n. [From Creosote.] (Chem.) Any one of three metameric substances, CH3.C6H4.OH, homologous with and resembling phenol. They are obtained from coal tar and wood tar, and are colorless, oily liquids or solids. Note: [Called also cresylic acid.] [1913 Webster]