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.]
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