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.]