a whitish, crystalline solid or slightly yellowish, oily liquid, CH(OH)OCH, prepared from guaiacum or wood creosote and used in medicine as an expectorant or antiseptic and as a chemical reagent
See guaiacol in American Heritage Dictionary 4
(gwīˈə-kôlˌ, -kōlˌ)
noun
A yellowish oily aromatic substance, C7H8O2, derived from guaiacum or wood creosote and used chiefly as an expectorant, antiseptic, and local anesthetic.