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From The Collaborative International Dictionary of English v.0.48:
Guaiacol \Guai"a*col\, n. [Guaiacum + -ol.] (Chem.) A colorless liquid, C7H8O2, with a peculiar odor. It is the methyl ether of pyrocatechin, and is obtained by distilling guaiacum from wood-tar creosote, and in other ways. It has been used in the past for treating pulmonary tuberculosis. [Webster 1913 Suppl.]